Imperial College London

Professor Sir Tejinder Singh Virdee FRS

Faculty of Natural SciencesDepartment of Physics

Professor of Physics
 
 
 
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Contact

 

+44 (0)20 7594 7590t.virdee Website

 
 
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Location

 

506Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

796 results found

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Ero J, Flechl M, Friedl M, Fruhwirth R, Ghete VM, Hartl C, Hormann N, Hrubec J, Jeitler M, Konig A, Kratschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Treberer-Treberspurg W, Waltenberger W, Wulz C-E, Mossolov V, Shumeiko N, Gonzalez JS, Alderweireldt S, De Wolf EA, Janssen X, Lauwers J, De Klundert MV, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Heracleous N, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Tavernier S, Van Doninck W, Van Mulders R, Van Parijs I, Brun H, Caillol C, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Luetic J, Maerschalk T, Marinov A, Randle-Conde A, Seva T, Vander Velde C, Vanlaer R, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Garcia G, Gul M, Poyraz D, Salva S, Schofbeck R, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Bakhshiansohi H, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, De Visscher S, Delaere C, Delcourt M, Forthomme L, Francois B, Giammanco A, Jafari A, Jez P, Komm M, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Alda Junior WL, Alves FL, Alves GA, Brito L, Hensel C, Moraes A, Pol ME, Teles PR, Batista Das Chagas EB, Carvalho W, Chinellato J, Custodio A, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Matos Figuciredo D, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Ahuja S, Bernardes CA, Dogra S, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Moon CS, Novaes SF, Padula SS, Romero Abad D, Ruiz Vargas JC, Alekset al., 2017, Measurement of the WZ production cross section in pp collisions at √s=7 and 8 TeV and search for anomalous triple gauge couplings at √s=8 TeV, EUROPEAN PHYSICAL JOURNAL C, Vol: 77, ISSN: 1434-6044

The WZ production cross section is measured by the CMS experiment at the CERN LHC in proton–proton collision data samples corresponding to integrated luminosities of 4.9fb−1 collected at s√=7TeV, and 19.6fb−1 at s√=8TeV. The measurements are performed using the fully-leptonic WZ decay modes with electrons and muons in the final state. The measured cross sections for 71<mZ<111GeV are σ(pp→WZ; s√=7TeV)=20.14±1.32(stat)±0.38(theo)±1.06(exp)±0.44(lumi)pb and σ(pp→WZ; s√=8TeV)=24.09±0.87(stat)±0.80(theo)±1.40(exp)±0.63(lumi)pb. Differential cross sections with respect to the Z boson pT, the leading jet pT, and the number of jets are obtained using the s√=8TeV data. The results are consistent with standard model predictions and constraints on anomalous triple gauge couplings are obtained.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Koenig A, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Waltenberger W, Wulz C-E, Dvornikov O, Makarenko V, Zykunov V, Mossolov V, Shumeiko N, Gonzalez JS, Alderweireldt S, De Wolf EA, Janssen X, Lauwers J, de Klundert MV, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Luetic J, Maerschalk T, Marinov A, Randle-Conde A, Seva T, Vander Velde C, Vanlaer P, Vannerom D, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Garcia G, Gul M, Khvastunov I, Poyraz D, Salva S, Schofbeck R, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Bakhshiansohi H, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, De Visscher S, Delaere C, Delcourt M, Francois B, Giammanco A, Jafari A, Jez P, Komm M, Krin-Tiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Alda Junior WL, Alves FL, Alves GA, Brito L, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Custodio A, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Figueiredo DM, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Ahuja S, Bernardes CA, Dogra S, Fernandez Perez Tomei TR, Gregores EM, Mercadante PC, Moon CS, Novaes SF, Padulaa SS, Romeret al., 2017, Charged-particle nuclear modification factors in PbPb and pPb collisions at root s(NN)=5.02 TeV, JOURNAL OF HIGH ENERGY PHYSICS, Vol: 2017, ISSN: 1029-8479

The spectra of charged particles produced within the pseudorapidity window |η| < 1 at sNN−−−−√=5.02sNN=5.02 TeV are measured using 404 μb−1 of PbPb and 27.4 pb−1 of pp data collected by the CMS detector at the LHC in 2015. The spectra are presented over the transverse momentum ranges spanning 0.5 < pT< 400 GeV in pp and 0.7 < pT< 400 GeV in PbPb collisions. The corresponding nuclear modification factor, RAA, is measured in bins of collision centrality. The RAA in the 5% most central collisions shows a maximal suppression by a factor of 7-8 in the pT region of 6-9 GeV. This dip is followed by an increase, which continues up to the highest pT measured, and approaches unity in the vicinity of pT = 200 GeV. The RAA is compared to theoretical predictions and earlier experimental results at lower collision energies. The newly measured pp spectrum is combined with the pPb spectrum previously published by the CMS collaboration to construct the pPb nuclear modification factor, RpA, up to 120 GeV. For pT> 20 GeV, RpA exhibits weak momentum dependence and shows a moderate enhancement above unity.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Koenig A, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Waltenberger W, Wulz C-E, Mossolov V, Shumeiko N, Gonzalez JS, Alderweireldt S, De Wolf EA, Janssen X, Lauwers J, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Heracleous N, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Caillol C, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Luetic J, Maerschalk T, Marinov A, Randle-Conde A, Seva T, Velde CV, Vanlaer P, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Garcia G, Gul M, Poyraz D, Salva S, Schofbeck R, Sharma A, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Bakhshiansohi H, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, De Visscher S, Delaere C, Delcourt M, Francois B, Giammanco A, Jafari A, Jez P, Komm M, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Alda Junior WL, Alves FL, Alves GA, Brito L, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Custodio A, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Matos Figueiredo D, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Ahuja S, Bernardes CA, Dogra S, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Moon CS, Novaes SF, Padula SS, Romero Abad D, Ruiz Vargas JC, Aleksandrov Aet al., 2017, Search for supersymmetry in events with photons and missing transverse energy in pp collisions at 13 TeV, Physics Letters B, Vol: 769, Pages: 391-412, ISSN: 0370-2693

The results of a search for new physics in final states with photons and missing transverse energy are reported. The study is based on a sample of proton–proton collisions collected at a center-of-mass energy of 13 TeV with the CMS detector in 2015, corresponding to an integrated luminosity of 2.3 fb−1. Final states with two photons and significant missing transverse energy are used to search for supersymmetric particles in models of supersymmetry (SUSY) with general gauge-mediated (GGM) supersymmetry breaking. No excess is observed with respect to the standard model expectation, and the results are used to set limits on gluino pair production and squark pair production in the GGM SUSY framework. Gluino masses below 1.65 TeV and squark masses below 1.37 TeV are excluded at a 95% confidence level.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Koenig A, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Treberer-Treberspurg W, Waltenberger W, Wulz C-E, Mossolov V, Shumeiko N, Gonzalez JS, Alderweireldt S, De Wolf EA, Janssen X, Lauwers J, De Klundert MV, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Heracleous N, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Caillol C, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Luetic J, Maerschalk T, Marinov A, Randle-conde A, Seva T, Velde CV, Vanlaer P, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Garcia G, Gul M, Poyraz D, Salva S, Schofbeck R, Sharma A, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Bakhshiansohi H, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, De Visscher S, Delaere C, Delcourt M, Francois B, Giammanco A, Jafari A, Jez P, Komm M, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Alda Junior WL, Alves FL, Alves GA, Brito L, Hensel C, Moraes A, Pol ME, Teles PR, Das Chagas EBB, Carvalho W, Chinellato J, Custodio A, Da Costa EM, Da Silveira GG, Damiao DDJ, Martins CDO, De Souza SF, Guativa LMH, Malbouisson H, Figueiredo DM, Herrera CM, Mundim L, Nogima H, Da Silva WLP, Santoro A, Sznajder A, Manganote EJT, Pereira AV, Ahuja S, Bernardes CA, Dogra S, Tomei TRFP, Gregores EM, Mercadante PG, Moon CS, Novaes SF, Padula SS, Abad DR, Vargas JCR, Aleksandrov A, Hadjiiska R, Iaydjiev P, Rodozov M, Stoykova S, Sultanov G, Vutova M, Dimitrov A Get al., 2017, Measurements of differential production cross sections for a Z boson in association with jets in pp collisions at s√=8 TeV, JOURNAL OF HIGH ENERGY PHYSICS, Vol: 2017, ISSN: 1029-8479

Cross sections for the production of a Z boson in association with jets in proton-proton collisions at a centre-of-mass energy of s√=8 TeV are measured using a data sample collected by the CMS experiment at the LHC corresponding to 19.6 fb−1. Differential cross sections are presented as functions of up to three observables that describe the jet kinematics and the jet activity. Correlations between the azimuthal directions and the rapidities of the jets and the Z boson are studied in detail. The predictions of a number of multileg generators with leading or next-to-leading order accuracy are compared with the measurements. The comparison shows the importance of including multi-parton contributions in the matrix elements and the improvement in the predictions when next-to-leading order terms are included.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Koenig A, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Treberer-Treberspurg W, Waltenberger W, Wulz C-E, Mossolov V, Shumeiko N, Gonzalez JS, Alderweireldt S, De Wolf EA, Janssen X, Lauwers J, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Heracleous N, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Caillol C, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Luetic J, Maer-Schalk T, Marinov A, Randle-Conde A, Seva T, Velde CV, Vanlaer P, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Garcia G, Gul M, Poyraz D, Salva S, Schofbeck R, Sharma A, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Bakhshiansohi H, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, De Visscher S, Delaere C, Delcourt M, Francois B, Giammanco A, Jafari A, Jez P, Komm M, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Alda Junior WL, Alves FL, Alves GA, Brito L, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Chinellato J, Custodio A, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Matos Figueiredo D, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Ahuja S, Bernardes CA, Dogra S, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Moon CS, Novaes SF, Padula SS, Romero Abad D, Ruiz Vargas JC, Alet al., 2017, Search for electroweak production of charginos in final states with two T leptons in pp collisions at root s=8 TeV, JOURNAL OF HIGH ENERGY PHYSICS, Vol: 2017, ISSN: 1029-8479

Results are presented from a search for the electroweak production of supersymmetric particles in pp collisions in final states with two τ leptons. The data sample corresponds to an integrated luminosity between 18.1 fb−1 and 19.6 fb−1 depending on the final state of τ lepton decays, at s√=8 TeV, collected by the CMS experiment at the LHC. The observed event yields in the signal regions are consistent with the expected standard model backgrounds. The results are interpreted using simplified models describing the pair production and decays of charginos or τ sleptons. For models describing the pair production of the lightest chargino, exclusion regions are obtained in the plane of chargino mass vs. neutralino mass under the following assumptions: the chargino decays into third-generation sleptons, which are taken to be the lightest sleptons, and the sleptons masses lie midway between those of the chargino and the neutralino. Chargino masses below 420 GeV are excluded at a 95% confidence level in the limit of a massless neutralino, and for neutralino masses up to 100 GeV, chargino masses up to 325 GeV are excluded at 95% confidence level. Constraints are also placed on the cross section for pair production of τ sleptons as a function of mass, assuming a massless neutralino.

Journal article

Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Koenig A, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Waltenberger W, Wulz C-E, Chekhovsky V, Dvornikov O, Dydyshka Y, Emeliantchik I, Litomin A, Makarenko V, Mossolov V, Stefanovitch R, Gonzalez JS, Zykunov V, Shumeiko N, Alderweireldt S, De Wolf EA, Janssen X, Lauwers J, Van de Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Luetic J, Maerschalk T, Marinov A, Randle-Conde A, Seva T, Vander Velde C, Vanlaer P, Vannerom D, Wang Q, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Salva S, Schofbeck R, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Bakhshiansohi H, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, De Visscher S, Delaere C, Delcourt M, Francois B, Giammanco A, Jafari A, Komm M, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Alda Junior WL, Alves FL, Alves GA, Brito L, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Custodio A, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Matos Figueiredo D, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Ahuja S, Bernardes CA, Dogra S, Fernandez Perez Tomei TR, Gret al., 2017, Search for massive resonances decaying into WW, WZ or ZZ bosons in proton-proton collisions at s√=13 TeV, JOURNAL OF HIGH ENERGY PHYSICS, Vol: 2017, ISSN: 1029-8479

A search is presented for new massive resonances decaying to WW, WZ or ZZ bosons in ℓνqq¯¯ and qq¯¯qq¯¯ final states. Results are based on data corresponding to an integrated luminosity of 2.3-2.7 fb−1 recorded in proton-proton collisions at s√=13 TeV with the CMS detector at the LHC. Decays of spin-1 and spin-2 resonances into two vector bosons are sought in the mass range 0.6-4.0 TeV. No significant excess over the standard model background is observed. Combining the results of the ℓνqq¯¯ and qq¯¯qq¯¯ final states, cross section and mass exclusion limits are set for models that predict heavy spin-1 and spin-2 resonances. This is the first search for a narrow-width spin-2 resonance at s√=13 TeV.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Koenig A, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Treberer-Treberspurg W, Waltenberger W, Wulz C-E, Mossolov V, Shumeiko N, Gonzalez JS, Alderweireldt S, De Wolf EA, Janssen X, Lauwers J, Van de Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Heracleous N, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Caillol C, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Luetic J, Maer-Schalk T, Marinov A, Randle-Conde A, Seva T, Vander Velde C, Vanlaer P, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Garcia G, Gul M, Poyraz D, Salva S, Schofbeck R, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, Ceard L, De Visscher S, Delaere C, Delcourt M, Forthomme L, Francois B, Giammanco A, Jafari A, Jez P, Komm M, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Alda Junior WL, Alves FL, Alves GA, Brito L, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Custodio A, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Matos Figueiredo D, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Ahuja S, Bernardes CA, Dogra S, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Moon CS, Novaes SF, Padula SS, Romero Abad D, Ruizet al., 2017, Measurement and QCD analysis of double-differential inclusive jet cross sections in pp collisions at √s = 8 TeV and cross section ratios to 2.76 and 7 TeV, JOURNAL OF HIGH ENERGY PHYSICS, Vol: 2017, ISSN: 1029-8479

A measurement of the double-differential inclusive jet cross section as a function of the jet transverse momentum pT and the absolute jet rapidity |y| is presented. Data from LHC proton-proton collisions at s√=8s=8 TeV, corresponding to an integrated luminosity of 19.7 fb−1, have been collected with the CMS detector. Jets are reconstructed using the anti-kT clustering algorithm with a size parameter of 0.7 in a phase space region covering jet pT from 74 GeV up to 2.5 TeV and jet absolute rapidity up to |y| = 3.0. The low-pT jet range between 21 and 74 GeV is also studied up to |y| = 4.7, using a dedicated data sample corresponding to an integrated luminosity of 5.6 pb−1. The measured jet cross section is corrected for detector effects and compared with the predictions from perturbative QCD at next-to-leading order (NLO) using various sets of parton distribution functions (PDF). Cross section ratios to the corresponding measurements performed at 2.76 and 7 TeV are presented. From the measured double-differential jet cross section, the value of the strong coupling constant evaluated at the Z mass is αS(MZ) = 0.1164− 0.0043+ 0.0060, where the errors include the PDF, scale, nonperturbative effects and experimental uncertainties, using the CT10 NLO PDFs. Improved constraints on PDFs based on the inclusive jet cross section measurement are presented.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Koenig A, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Waltenberger W, Wulz C-E, Dvornikov O, Makarenko V, Zykunov V, Mossolov V, Shumeiko N, Suarez Gonzalez J, Alderweireldt S, De Wolf EA, Janssen X, Lauwers J, Van de Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Luetic J, Maerschalk T, Marinov A, Randle-Conde A, Seva T, Vander Velde C, Vanlaer P, Vannerom D, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Garcia G, Gul M, Khvastunov I, Poyraz D, Salva S, Schoefbeck R, Sharma A, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Bakhshiansohi H, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, De Visscher S, Delaere C, Delcourt M, Francois B, Giammanco A, Jafari A, Jez P, Komm M, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Alda Junior WL, Alves FL, Alves GA, Brito L, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Custodio A, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Matos Figueiredo D, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Ahuja S, Bernardes CA, Dogra S, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Moon CS, Novaet al., 2017, Observation of Charge-Dependent Azimuthal Correlations in p-Pb Collisions and Its Implication for the Search for the Chiral Magnetic Effect, PHYSICAL REVIEW LETTERS, Vol: 118, ISSN: 0031-9007

Charge-dependent azimuthal particle correlations with respect to the second-order event plane in p−Pb and PbPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV have been studied with the CMS experiment at the LHC. The measurement is performed with a three-particle correlation technique, using two particles with the same or opposite charge within the pseudorapidity range |η|<2.4, and a third particle measured in the hadron forward calorimeters (4.4<|η|<5). The observed differences between the same and opposite sign correlations, as functions of multiplicity and η gap between the two charged particles, are of similar magnitude in p−Pb and PbPb collisions at the same multiplicities. These results pose a challenge for the interpretation of charge-dependent azimuthal correlations in heavy ion collisions in terms of the chiral magnetic effect.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Koenig A, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Waltenberger W, Wulz C-E, Dvornikov O, Makarenko V, Zykunov V, Mossolov V, Shumeiko N, Gonzalez JS, Alderweireldt S, De Wolf EA, Janssen X, Lauwers J, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Luetic J, Maerschalk T, Marinov A, Randle-Conde A, Seva T, Vander Velde C, Vanlaer P, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Garcia G, Gul M, Khvastunov I, Poyraz D, Salva S, Schofbeck R, Sharma A, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Bakhshiansohi H, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, De Visscher S, Delaere C, Delcourt M, Francois B, Giammanco A, Jafari A, Jez P, Komm M, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Alda Junior WL, Alves FL, Alves GA, Brito L, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Custodio A, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Matos Figueiredo D, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Ahuja S, Bernardes CA, Dogra S, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Moon CS, Novaes SF, Padula SS, Romero Abad Det al., 2017, Measurement of the tt¯ production cross section using events in the eμ final state in pp collisions at √s=13TeV, EUROPEAN PHYSICAL JOURNAL C, Vol: 77, ISSN: 1434-6044

The cross section of top quark–antiquark pair production in proton–proton collisions at s√=13TeV is measured by the CMS experiment at the LHC, using data corresponding to an integrated luminosity of 2.2fb−1. The measurement is performed by analyzing events in which the final state includes one electron, one muon, and two or more jets, at least one of which is identified as originating from hadronization of a b quark. The measured cross section is 815±9(stat)±38(syst)±19(lumi) pb, in agreement with the expectation from the standard model.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Ero J, Flechl M, Friedl M, Fruhwirth R, Ghete VM, Hartl C, Hormann N, Hrubec J, Jeitler M, Konig A, Kratschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Waltenberger W, Wulz C-E, Dvornikov O, Makarenko V, Zykunov V, Mossolov V, Shumeiko N, Gonzalez JS, Alderweireldt S, De Wolf EA, Janssen X, Lauwers J, De Klundert MV, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Luetic J, Maerschalk T, Marinov A, Randle-conde A, Seva T, Vander Velde C, Vanlaer P, Vannerom D, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Garcia G, Gul M, Khvastunov I, Poyraz D, Salva S, Schofbeck R, Sharma A, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Bakhshiansohi H, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, De Visscher S, Delaere C, Delcourt M, Francois B, Giammanco A, Jafari A, Jez P, Komm M, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Alda Junior WL, Alves FL, Alves GA, Brito L, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Custodio A, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Matos Figueiredo D, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Ahuja S, Bernardes CA, Dogra S, Fernandez Perez Tomei TR, Gregores EM, Mercadante PC, Moon CS, Novaes SF, Padula Set al., 2017, Search for CP violation in t(t)over-bar production and decay in proton-proton collisions at root s=8 TeV, JOURNAL OF HIGH ENERGY PHYSICS, Vol: 2017, ISSN: 1029-8479

The results of a first search for CP violation in the production and decay of top quark-antiquark (tt¯) pairs are presented. The search is based on asymmetries in T-odd, triple-product correlation observables, where T is the time-reversal operator. The analysis uses a sample of proton-proton collisions at s√=8 TeV collected by the CMS experiment, corresponding to an integrated luminosity of 19.7 fb−1. Events are selected having one electron or muon and at least four jets. The T-odd observables are measured using four-momentum vectors associated with tt¯ production and decay. The measured asymmetries exhibit no evidence for CP-violating effects, consistent with the expectation from the standard model.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Koenig A, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Waltenberger W, Wulz C-E, Dvornikov O, Makarenko V, Zykunov V, Mossolov V, Shumeiko N, Gonzalez JS, Alderweireldt S, De Wolf EA, Janssen X, Lauwers J, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Luetic J, Maerschalk T, Marinov A, Randle-conde A, Seva T, Velde CV, Vanlaer P, Vannerom D, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Garcia G, Gul M, Khvastunov I, Poyraz D, Salva S, Schofbeck R, Sharma A, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Bakhshiansohi H, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, De Visscher S, Delaere C, Delcourt M, Francois B, Giammanco A, Jafari A, Jez P, Komm M, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Aida Junior WL, Alves FL, Alves GA, Brito L, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Custodio A, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Matos Figueiredo D, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Ahuja S, Bernardes CA, Dogra S, Fernandez Perez Tomei TR, Gregores EM, Mercadante PC, Moon CS, Novaes SF, Padulaet al., 2017, Search for heavy neutrinos or third-generation leptoquarks in final states with two hadronically decaying τ leptons and two jets in proton-proton collisions at s√=13 TeV, JOURNAL OF HIGH ENERGY PHYSICS, Vol: 2017, ISSN: 1029-8479

A search for new particles has been conducted using events with two high transverse momentum (pT) τ leptons that decay hadronically, at least two high-pT jets, and missing transverse energy from the τ lepton decays. The analysis is performed using data from proton-proton collisions, collected by the CMS experiment in 2015 at s√=13 TeV, corresponding to an integrated luminosity of 2.1 fb−1. The results are interpreted in two physics models. The first model involves heavy right-handed neutrinos, Nℓ (ℓ = e, μ, τ), and right-handed charged bosons, WR, arising in a left-right symmetric extension of the standard model. Masses of the WR boson below 2.35 (1.63) TeV are excluded at 95% confidence level, assuming the Nτ mass is 0.8 (0.2) times the mass of the WR boson and that only the Nτ flavor contributes to the WR decay width. In the second model, pair production of third-generation scalar leptoquarks that decay into ττbb is considered. Third-generation scalar leptoquarks with masses below 740 GeV are excluded, assuming a 100% branching fraction for the leptoquark decay to a τ lepton and a bottom quark. This is the first search at hadron colliders for the third-generation Majorana neutrino, as well as the first search for third-generation leptoquarks in the final state with a pair of hadronically decaying τ leptons and jets.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Koenig A, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Treberer-Treberspurg W, Waltenberger W, Wulz C-E, Mossolov V, Shumeiko N, Gonzalez JS, Alderweireldt S, De Wolf EA, Janssen X, Lauwers J, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Heracleous N, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Caillol C, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Luetic J, Maerschalk T, Marinov A, Randle-conde A, Seva T, Vander Velde C, Vanlaer P, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Garcia G, Gul M, Poyraz D, Salva S, Schofbeck R, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Bakhshiansohi H, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, De Visscher S, Delaere C, Delcourt M, Francois B, Giammanco A, Jafari A, Jez P, Komm M, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Alda Junior WL, Alves FL, Alves GA, Brito L, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Custodio A, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Matos Figueiredo D, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Ahuja S, Bernardes CA, Dogra S, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Moon CS, Novaes SF, Padula SS, Romero Abad D, Ruiz Vargaset al., 2017, Measurements of differential cross sections for associated production of a W boson and jets in proton-proton collisions at √s=8  TeV, PHYSICAL REVIEW D, Vol: 95, ISSN: 2470-0010

Differential cross sections for a W boson produced in association with jets are measured in a data sample of proton-proton collisions at a center-of-mass energy of 8 TeV recorded with the CMS detector and corresponding to an integrated luminosity of 19.6  fb−1. The W bosons are identified through their decay mode W→μν. The cross sections are reported as functions of jet multiplicity, transverse momenta, and the scalar sum of jet transverse momenta (HT) for different jet multiplicities. Distributions of the angular correlations between the jets and the muon are examined, as well as the average number of jets as a function of HT and as a function of angular variables. The measured differential cross sections are compared with tree-level and higher-order recent event generators, as well as next-to-leading-order and next-to-next-to-leading-order theoretical predictions. The agreement of the generators with the measurements builds confidence in their use for the simulation of W+jets background processes in searches for new physics at the LHC.

Journal article

Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirthl R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Koenig A, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Waltenberger W, Wulz C-E, Chekhovsky V, Dvornikov O, Dydyshka Y, Emeliantchik I, Litomin A, Makarenko V, Mossolov V, Stefanovitch R, Gonzalez JS, Zykunov V, Shumeiko N, Alderweireldt S, De Wolf EA, Janssen X, Lauwers J, de Klundert MV, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Luetic J, Maerschalk T, Marinov A, Randle-conde A, Seva T, Vander Velde C, Vanlaer P, Vannerom D, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Salva S, Schofbeck R, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Bakhshiansohi H, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, De Visscher S, Delaere C, Delcourt M, Francois B, Giammanco A, Jafari A, Komm M, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Alda Junior WL, Alves FL, Alves GA, Brito L, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Custodio A, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Matos Figueiredo D, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Ahuja S, Bernardes CA, Dogra S, Fernandez Perez Tomei TR, Gregores EMet al., 2017, Search for dark matter and unparticles in events with a Z boson and missing transverse momentum in proton-proton collisions at root s=13 TeV, JOURNAL OF HIGH ENERGY PHYSICS, Vol: 2017, ISSN: 1029-8479

A search for dark matter and unparticle production at the LHC has been performed using events containing two charged leptons (electrons or muons), consistent with the decay of a Z boson, and large missing transverse momentum. This study is based on data collected with the CMS detector in 2015, corresponding to an integrated luminosity of 2.3 fb−1 of proton-proton collisions at the LHC, at a center-of-mass energy of 13 TeV. No excess over the standard model expectation is observed. Compared to previous searches in this topology, which exclusively relied on effective field theories, the results are interpreted in terms of a simplified model of dark matter production for both vector and axial vector couplings between a mediator and dark matter particles. The first study of this class of models using CMS data at s√=13s=13 TeV is presented. Additionally, effective field theories of dark matter and unparticle production are used to interpret the data.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Ero J, Flechl M, Friedl M, Fruhwirth R, Ghete VM, Hartl C, Hormann N, Hrubec J, Jeitler M, Konig A, Kratschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Waltenberger W, Wulz C-E, Dvornikov O, Makarenko V, Zykunov V, Mossolov V, Shumeiko N, Gonzalez JS, Alderweireldt S, De Wolf EA, Janssen X, Lauwers J, de Klundert MV, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Luetic J, Maerschalk T, Marinov A, Randle-conde A, Seva T, Vander Velde C, Vanlaer P, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Garcia G, Gul M, Khvastunov I, Poyraz D, Salva S, Schofbeck R, Sharma A, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Bakhshiansohi H, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, De Visscher S, Delaere C, Delcourt M, Francois B, Giammanco A, Jafari A, Jez P, Komm M, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Alda Junior WL, Alves FL, Alves GA, Brito L, Hensel C, Moraes A, Pol ME, Teles PR, Das Chagas EBB, Carvalho W, Chinellato J, Custodio A, Da Costa EM, Da Silveira GG, Damiao DDJ, Martins CDO, De Souza SF, Guativa LMH, Malbouisson H, Figueiredo DM, Herrera CM, Mundim L, Nogima H, Da Silva WLP, Santoro A, Sznajder A, Manganote EJT, Pereira AV, Ahuja S, Bernardes CA, Dogra S, Tomei TRFP, Gregores EM, Mercadante PG, Moon CS, Novaes SF, Padula SS, Abad DR, Vargas JCR, Aleksandrov A, Hadjiiska R, Iaydjiev P, Rodozov M, Stoykova S, Sultanov G, Vutova M, Dimitrov Aet al., 2017, Searches for invisible decays of the Higgs boson in pp collisions at √s = 7, 8, and 13 TeV, JOURNAL OF HIGH ENERGY PHYSICS, Vol: 2017, ISSN: 1029-8479

Searches for invisible decays of the Higgs boson are presented. The data collected with the CMS detector at the LHC correspond to integrated luminosities of 5.1, 19.7, and 2.3 fb−1 at centre-of-mass energies of 7, 8, and 13 TeV, respectively. The search channels target Higgs boson production via gluon fusion, vector boson fusion, and in association with a vector boson. Upper limits are placed on the branching fraction of the Higgs boson decay to invisible particles, as a function of the assumed production cross sections. The combination of all channels, assuming standard model production, yields an observed (expected) upper limit on the invisible branching fraction of 0.24 (0.23) at the 95% confidence level. The results are also interpreted in the context of Higgs-portal dark matter models.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Koenig A, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Waltenberger W, Wulz C-E, Dvornikov O, Makarenko V, Zykunov V, Mossolov V, Shumeiko N, Gonzalez JS, Alderweireldt S, De Wolf EA, Janssen X, Lauwers J, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Heracleous N, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Luetic J, Maerschalk T, Marinov A, Randle-Conde A, Seva T, Velde CV, Vanlaer P, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Garcia G, Gul M, Poyraz D, Salva S, Schofbeck R, Sharma A, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Bakhshiansohi H, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, De Visscher S, Delaere C, Delcourt M, Francois B, Giammanco A, Jafari A, Jez P, Komm M, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Vidal Marono M, Wertz S, Beliy N, Alda Junior WL, Alves FL, Alves GA, Brito L, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Custodio A, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Matos Figueiredo D, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Ahuja S, Bernardes CA, Dogra S, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Moon CS, Novaes SF, Padula SS, Romero Abad Det al., 2017, Search for heavy resonances decaying into a vector boson and a Higgs boson in final states with charged leptons, neutrinos, and b quarks, PHYSICS LETTERS B, Vol: 768, Pages: 137-162, ISSN: 0370-2693

A search for heavy resonances decaying to a Higgs boson and a vector boson is presented. The analysis is performed using data samples collected in 2015 by the CMS experiment at the LHC in proton–proton collisions at a center-of-mass energy of 13 TeV, corresponding to integrated luminosities of 2.2–2.5 fb−1. The search is performed in channels in which the vector boson decays into leptonic final states (Z→ννZ→νν, W→ℓνW→ℓν, and Z→ℓℓZ→ℓℓ, with ℓ=e,μℓ=e,μ), while the Higgs boson decays to collimated b quark pairs detected as a single massive jet. The discriminating power of a jet mass requirement and a b jet tagging algorithm are exploited to suppress the standard model backgrounds. The event yields observed in data are consistent with the background expectation. In the context of a theoretical model with a heavy vector triplet, a resonance with mass less than 2 TeV is excluded at 95% confidence level. The results are also interpreted in terms of limits on the parameters of the model, improving on the reach of previous searches.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Koenig A, Krammer M, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Schoefbeck R, Strauss J, Treberer-Treberspurg W, Waltenberger W, Wulz C-E, Mossolov V, Shumeiko N, Gonzalez JS, Alderweireldt S, Cornelis T, De Wolf EA, Janssen X, Knutsson A, Lauwers J, Luyckx S, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Heracleous N, Keaveney J, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Strom D, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Caillol C, Clerbaux B, De Lentdecker G, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Maerschalk T, Marinov A, Randle-conde A, Seva T, Vander Velde C, Vanlaer P, Yonamine R, Zenoni F, Zhang F, Benucci L, Cimmino A, Crucy S, Dobur D, Fagot A, Garcia G, Gul M, Mccartin J, Rios AAO, Poyraz D, Ryckbosch D, Salva S, Sigamani M, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Basegmez S, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, Ceard L, De Visscher S, Delaere C, Delcourt M, Favart D, Forthomme L, Giammanco A, Jafari A, Jez P, Komm M, Lemaitre V, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Beliy N, Hammad GH, Alda Junior WL, Alves FL, Alves GA, Brito L, Correa Martins Junior M, Hamer M, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Custodio A, Da Costa EM, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Matos Figueiredo D, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Ahuja S, Bernardes CAet al., 2017, Measurement of the transverse momentum spectra of weak vector bosons produced in proton-proton collisions at s√=8 TeV, Journal of High Energy Physics, Vol: 2017, ISSN: 1029-8479

The transverse momentum spectra of weak vector bosons are measured in the CMS experiment at the LHC. The measurement uses a sample of proton-proton collisions at s√=8 TeV, collected during a special low-luminosity running that corresponds to an integrated luminosity of 18.4 ± 0.5 pb−1. The production of W bosons is studied in both electron and muon decay modes, while the production of Z bosons is studied using only the dimuon decay channel. The ratios of W− to W+ and Z to W differential cross sections are also measured. The measured differential cross sections and ratios are compared with theoretical predictions up to next-to-next leading order in QCD.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Koenig A, Krammer M, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Treberer-Treberspurg W, Waltenberger W, Wulz C-E, Mossolov V, Shumeiko N, Gonzalez JS, Alderweireldt S, Cornelis T, De Wolf EA, Janssen X, Knutsson A, Lauwers J, Luyckx S, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Heracleous N, Keaveney J, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Strom D, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Caillol C, Clerbaux B, De Lentdecker G, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Maerschalk T, Marinov A, Randle-conde A, Seva T, Velde CV, Vanlaer P, Yonamine R, Zenoni F, Zhang F, Benucci L, Cimmino A, Crucy S, Dobur D, Fagot A, Garcia G, Gul M, Mccartin J, Rios AAO, Poyraz D, Ryckbosch D, Salva S, Schofbeck R, Sigamani M, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, Ceard L, De Visscher S, Delaere C, Delcourt M, Forthomme L, Francois B, Giammanco A, Jafari A, Jez P, Komm M, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Hammad GH, Alda Junior WL, Alves FL, Alves GA, Brito L, Correa Martins Junior M, Hamer M, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Custodio A, Da Costa EM, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Matos Figueiredo D, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Ahuja S, Bernardet al., 2017, Multiplicity and rapidity dependence of strange hadron production in pp, pPb, and PbPb collisions at the LHC, PHYSICS LETTERS B, Vol: 768, Pages: 103-129, ISSN: 0370-2693

Measurements of strange hadron (View the MathML sourceKS0, View the MathML sourceΛ+Λ‾, and View the MathML sourceΞ−+Ξ‾+) transverse momentum spectra in pppp, pPbpPb, and PbPb collisions are presented over a wide range of rapidity and event charged-particle multiplicity. The data were collected with the CMS detector at the CERN LHC in pppp collisions at View the MathML sources=7TeV, pPbpPb collisions at View the MathML sourcesNN=5.02TeV, and PbPb collisions at View the MathML sourcesNN=2.76TeV. The average transverse kinetic energy is found to increase with multiplicity, at a faster rate for heavier strange particle species in all systems. At similar multiplicities, the difference in average transverse kinetic energy between different particle species is observed to be larger for pppp and pPbpPb events than for PbPb events. In pPbpPb collisions, the average transverse kinetic energy is found to be slightly larger in the Pb-going direction than in the p-going direction for events with large multiplicity. The spectra are compared to models motivated by hydrodynamics.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Koenig A, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Treberer-Treberspurg W, Waltenberger W, Wulz C-E, Mossolov V, Shumeiko N, Gonzalez JS, Alderweireldt S, De Wolf EA, Janssen X, Knutsson A, Lauwers J, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Heracleous N, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Caillol C, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Luetic J, Maerschalk T, Marinov A, Randle-conde A, Seva T, Vander Velde C, Vanlaer P, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Garcia G, Gul M, Mccartin J, Poyraz D, Salva S, Schofbeck R, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, Ceard L, De Visscher S, Delaere C, Delcourt M, Forthomme L, Francois B, Giammanco A, Jafari A, Jez P, Komm M, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Alda Junior WL, Alves FL, Alves GA, Brito L, Correa Martins Junior M, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Custodio A, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Matos Figueiredo D, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Ahuja S, Bernardes CA, Dogra S, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Mooet al., 2017, Search for top quark decays via Higgs-boson-mediated flavor-changing neutral currents in pp collisions at s√=8 TeV, Journal of High Energy Physics, Vol: 2017, ISSN: 1029-8479

A search is performed for Higgs-boson-mediated flavor-changing neutral currents in the decays of top quarks. The search is based on proton-proton collision data corresponding to an integrated luminosity of 19.7 fb−1 at a center-of-mass energy of 8 TeV collected with the CMS detector at the LHC. Events in which a top quark pair is produced with one top quark decaying into a charm or up quark and a Higgs boson (H), and the other top quark decaying into a bottom quark and a W boson are selected. The Higgs boson in these events is assumed to subsequently decay into either dibosons or difermions. No significant excess is observed above the expected standard model background, and an upper limit at the 95% confidence level is set on the branching fraction ℬ(t → Hc) of 0.40% and ℬ(t → Hu) of 0.55%, where the expected upper limits are 0.43% and 0.40%, respectively. These results correspond to upper limits on the square of the flavor-changing Higgs boson Yukawa couplings |λtcH|2 < 6.9 × 10− 3 and |λtuH|2 < 9.8 × 10− 3.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Koenig A, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Treberer-Treberspurg W, Waltenberger W, Wulz C-E, Mossolov V, Shumeiko N, Gonzalez JS, Alderweireldt S, De Wolf EA, Janssen X, Lauwers J, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Heracleous N, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Caillol C, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Luetic J, Maerschalk T, Marinov A, Randle-conde A, Seva T, Vander Velde C, Vanlaer P, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Garcia G, Gul M, Poyraz D, Salva S, Schofbeck R, Sharma A, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Bakhshiansohi H, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, De Visscher S, Delaere C, Delcourt M, Francois B, Giammanco A, Jafari A, Jez P, Komm M, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Alda Junior WL, Alves FL, Alves GA, Brito L, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Custodio A, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Matos Figueiredo D, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Ahuja S, Bernardes CA, Dogra S, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Moon CS, Novaes SF, Padula SS, Romero Abad D Ret al., 2017, Search for narrow resonances in dilepton mass spectra in proton-proton collisions at root s=13 TeV and combination with 8 TeV data, PHYSICS LETTERS B, Vol: 768, Pages: 57-80, ISSN: 0370-2693

A search for narrow resonances in dielectron and dimuon invariant mass spectra has been performed using data obtained from proton–proton collisions at collected with the CMS detector. The integrated luminosity for the dielectron sample is 2.7 fb−1 and for the dimuon sample 2.9 fb−1. The sensitivity of the search is increased by combining these data with a previously analyzed set of data obtained at and corresponding to a luminosity of 20 fb−1. No evidence for non-standard-model physics is found, either in the 13 TeV data set alone, or in the combined data set. Upper limits on the product of production cross section and branching fraction have also been calculated in a model-independent manner to enable interpretation in models predicting a narrow dielectron or dimuon resonance structure. Limits are set on the masses of hypothetical particles that could appear in new-physics scenarios. For the particle, which arises in the sequential standard model, and for the superstring inspired particle, 95% confidence level lower mass limits for the combined data sets and combined channels are found to be 3.37 and 2.82 TeV, respectively. The corresponding limits for the lightest Kaluza–Klein graviton arising in the Randall–Sundrum model of extra dimensions with coupling parameters 0.01 and 0.10 are 1.46 and 3.11 TeV, respectively. These results significantly exceed the limits based on the 8 TeV LHC data.

Journal article

Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirthl R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Koenig A, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Waltenberger W, Wulz C-E, Dvornikov O, Makarenko V, Mossolov V, Gonzalez JS, Zykunov V, Shumeiko N, Alderweireldt S, De Wolf EA, Janssen X, Lauwers J, De Klundert MV, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Luetic J, Maerschalk T, Marinov A, Randle-Conde A, Seva T, Velde CV, Vanlaer P, Vannerom D, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Salva S, Schofbeck R, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Bakhshiansohi H, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, De Visscher S, Delaere C, Delcourt M, Francois B, Giammanco A, Jafari A, Komm M, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Alda Junior WL, Alves FL, Alves GA, Brito L, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Custodio A, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Matos Figueiredo D, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Ahuja S, Bernardes CA, Dogra S, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Moon CS, Novaes SF, Padula SS, Romero Abad D, Ruiz Vargas JC, Aleksandet al., 2017, Search for dijet resonances in proton-proton collisions at root s=13 TeV and constraints on dark matter and other models, Physics Letters B, Vol: 769, Pages: 520-542, ISSN: 0370-2693

A search is presented for narrow resonances decaying to dijet final states in proton–proton collisions at using data corresponding to an integrated luminosity of 12.9 fb−1. The dijet mass spectrum is well described by a smooth parameterization and no significant evidence for the production of new particles is observed. Upper limits at 95% confidence level are reported on the production cross section for narrow resonances with masses above 0.6 TeV. In the context of specific models, the limits exclude string resonances with masses below 7.4 TeV, scalar diquarks below 6.9 TeV, axigluons and colorons below 5.5 TeV, excited quarks below 5.4 TeV, color-octet scalars below 3.0 TeV, bosons below 2.7 TeV, bosons below 2.1 TeV and between 2.3 and 2.6 TeV, and RS gravitons below 1.9 TeV. These extend previous limits in the dijet channel. Vector and axial-vector mediators in a simplified model of interactions between quarks and dark matter are excluded below 2.0 TeV. The first limits in the dijet channel on dark matter mediators are presented as functions of dark matter mass and are compared to the exclusions of dark matter in direct detection experiments.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Koenig A, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Treberer-Treberspurg W, Waltenberger W, Wulz C-E, Mossolov V, Shumeiko N, Gonzalez JS, Alderweireldt S, De Wolf EA, Janssen X, Lauwers J, Van de Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Heracleous N, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Caillol C, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Luetic J, Maerschalk T, Marinov A, Randle-Conde A, Seva T, Vander Velde C, Vanlaer P, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Garcia G, Gul M, Poyraz D, Salva S, Schoefbeck R, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Bakhshiansohi H, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, De Visscher S, Delaere C, Delcourt M, Forthomme L, Francois B, Giammanco A, Jafari A, Jez P, Komm M, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Alda Junior WL, Alves FL, Alves GA, Brito L, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Custodio A, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Matos Figueiredo D, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Ahuja S, Bernardes CA, Dogra S, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Moon CS, Novaes SF, Padula SS, Abad DR, Ruiet al., 2017, Measurement of the production cross section of a W boson in association with two b jets in pp collisions at root s=8TeV, European Physical Journal C: Particles and Fields, Vol: 77, ISSN: 1434-6044

The production cross section of a W boson in association with two b jets is measured using a sample of proton–proton collisions at s√=8TeVs=8TeV collected by the CMS experiment at the CERN LHC. The data sample corresponds to an integrated luminosity of 19.8 fb-1fb-1 . The W bosons are reconstructed via their leptonic decays, W→ℓνW→ℓν , where ℓ=μℓ=μ or ee . The fiducial region studied contains exactly one lepton with transverse momentum pℓT>30GeVpTℓ>30GeV and pseudorapidity |ηℓ|<2.1|ηℓ|<2.1 , with exactly two b jets with pT>25GeVpT>25GeV and |η|<2.4|η|<2.4 and no other jets with pT>25GeVpT>25GeV and |η|<4.7|η|<4.7 . The cross section is measured to be σ(pp→W(ℓν)σ(pp→W(ℓν) + bb¯¯¯)=0.64±0.03(stat)±0.10(syst)±0.06(theo)±0.02(lumi)pbbb¯)=0.64±0.03(stat)±0.10(syst)±0.06(theo)±0.02(lumi)pb , in agreement with standard model predictions.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Koenig A, Krammer M, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Treberer-Treberspurg W, Waltenberger W, Wulz C-E, Mossolov V, Shumeiko N, Gonzalez JS, Alderweireldt S, Cornelis T, De Wolf EA, Janssen X, Knutsson A, Lauwers J, Luyckx S, Van de Klundert M, Van Haevermaet H, Van Mechelen R, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Heracleous N, Keaveney J, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Strom D, Tavernier S, Van Doninck W, Van Mulders R, Van Parijs I, Brun H, Caillol C, Clerbaux B, De Lentdecker G, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Maerschalk T, Marinov A, Randle-Conde A, Seva T, Vander Velde C, Vanlaer R, Yonamine R, Zenoni F, Zhang F, Benucci L, Cimmino A, Crucy S, Dobur D, Fagot A, Garcia G, Gul M, Mccartin J, Rios AAO, Poyraz D, Ryckbosch D, Salva S, SchOfbeck R, Sigamani M, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Beluffi C, Bondu, Brochet S, Bruno G, Caudron A, Ceard L, De Visscher S, Delaere C, Delcourt M, Forthomme L, Francois B, Giammanco A, Jafari A, Jez R, Komm M, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Hammad GH, Alda Junior WL, Alves FL, Alves GA, Brito L, Correa Martins Junior M, Hamer M, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Custodio A, Da Costa EM, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Matos Figueiredo D, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Ahuja S, Beet al., 2017, Search for top squark pair production in compressed-mass-spectrum scenarios in proton-proton collisions at √s=8 TeV using the αT variable, PHYSICS LETTERS B, Vol: 767, Pages: 403-430, ISSN: 0370-2693

An inclusive search is performed for supersymmetry in final states containing jets and an apparent imbalance in transverse momentum, View the MathML sourcep→Tmiss, due to the production of unobserved weakly interacting particles in pp collisions at a centre-of-mass energy of 8 TeV. The data, recorded with the CMS detector at the CERN LHC, correspond to an integrated luminosity of 18.5 fb−1. The dimensionless kinematic variable αTαT is used to discriminate between events with genuine View the MathML sourcep→Tmiss associated with unobserved particles and spurious values of View the MathML sourcep→Tmiss arising from jet energy mismeasurements. No excess of event yields above the expected standard model backgrounds is observed. The results are interpreted in terms of constraints on the parameter space of several simplified models of supersymmetry that assume the pair production of top squarks. The search provides sensitivity to a broad range of top squark (View the MathML sourcet˜) decay modes, including the two-body decay View the MathML sourcet˜→cχ˜10, where c is a charm quark and View the MathML sourceχ˜10 is the lightest neutralino, as well as the four-body decay View the MathML sourcet˜→bff¯′χ˜10, where b is a bottom quark and f and View the MathML sourcef¯′ are fermions produced in the decay of an intermediate off-shell W boson. These modes dominate in scenarios in which the top squark and lightest neutralino are nearly degenerate in mass. For these modes, top squarks with masses as large as 260 and 225 GeV are excluded, respectively, for the two- and four-body decays.

Journal article

Ruiz Vargas JC, Battilana C, Malberti M, Pigazzini S, Nardo GD, Thyssen F, Zanetti M, Fedi G, Giassi A, Grippo MT, Ligabue F, Lomtadze T, Martini L, Messineo A, Palla F, Rizzi A, SavoyNavarro A, Spagnolo P, Tenchini R, Tonelli G, Venturi A, Verdini PG, Barone L, Cavallari F, Cipriani M, Re DD, Diemoz M, Gelli S, Longo E, Margaroli F, Marzocchi B, Meridiani P, Organtini G, Paramatti R, Preiato F, Rahatlou S, Rovelli C, Santanastasio F, Amapane N, Arcidiacono R, Argiro S, Arneodo M, Bartosik N, Bellan R, Biino C, Cartiglia N, Cenna F, Costa M, Covarelli R, Degano A, Demaria N, Finco L, Kiani B, Mariotti C, Maselli S, Migliore E, Monaco V, Monteil E, Obertino MM, Pacher L, Pastrone N, Pelliccioni M, Pinna Angioni GL, Ravera F, Romero A, Ruspa M, Sacchi R, Shchelina K, Sola V, Solano A, Staiano A, Traczyk P, Belforte S, Casarsa M, Cossutti F, Della Ricca G, Zanetti A, Kim DH, Kim GN, Kim MS, Lee S, Lee SW, Oh YD, Sekmen S, Son DC, Yang YC, Lee A, Kim H, Brochero Cifuentes JA, Kim TJ, Cho S, Choi S, Go Y, Gyun D, Ha S, Hong B, Jo Y, Kim Y, Lee B, Lee K, Lee KS, Lee S, Lim J, Park SK, Roh Y, Almond J, Kim J, Lee H, Oh SB, Radburn-Smith BC, Seo SH, Yang UK, Yoo HD, Yu GB, Choi M, Kim H, Kim JH, Lee JSH, Park IC, Ryu G, Ryu MS, Choi Y, Goh J, Hwang C, Lee J, Yu I, Dudenas V, Juodagalvis A, Vaitkus J, Ahmed I, Ibrahim ZA, Komaragiri JR, Ali MABM, Mohamad Idris F, Wan Abdullah WAT, Yusli MN, Zolkapli Z, Castilla-Valdez H, Cruz-Burelo EDL, Heredia-De La Cruz I, Hernandez-Almada A, Lopez-Fernandez R, Magaa Villalba R, Mejia Guisao J, Sanchez-Hernandez A, Carrillo Moreno S, Oropeza Barrera C, Vazquez Valencia F, Carpinteyro S, Pedraza I, Salazar Ibarguen HA, Uribe Estrada C, Morelos Pineda A, Krofcheck D, Butler PH, Ahmad A, Ahmad M, Hassan Q, Hoorani HR, Khan WA, Saddique A, Shah MA, Shoaib M, Waqas M, Bialkowska H, Bluj M, Boimska B, Frueboes T, Grski M, Kazana M, Nawrocki K, Romanowska-Rybinska K, Szleper M, Zalewski P, Bunkowski K, Byszuk A, Doroba K, Kalinowski A, Konecki Met al., 2017, Search for heavy resonances decaying to tau lepton pairs in proton-proton collisions at s√=13 TeV, Journal of High Energy Physics, Vol: 2017, ISSN: 1029-8479

A search for heavy resonances that decay to tau lepton pairs is performed using proton-proton collisions at s√=13 TeV. The data were collected with the CMS detector at the CERN LHC and correspond to an integrated luminosity of 2.2 fb−1. The observations are in agreement with standard model predictions. An upper limit at 95% confidence level on the product of the production cross section and branching fraction into tau lepton pairs is calculated as a function of the resonance mass. For the sequential standard model, the presence of Z′ bosons decaying into tau lepton pairs is excluded for Z′ masses below 2.1 TeV, extending previous limits for this final state. For the topcolor-assisted technicolor model, which predicts Z′ bosons that preferentially couple to third-generation fermions, Z′ masses below 1.7 TeV are excluded, representing the most stringent limit to date.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Koenig A, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Treberer-Treberspurg W, Waltenberger W, Wulz C-E, Mossolov V, Shumeiko N, Gonzalez JS, Alderweireldt S, De Wolf EA, Janssen X, Lauwers J, De Klundert MV, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Heracleous N, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Caillol C, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Luetic J, Maerschalk T, Marinov A, Randle-conde A, Seva T, Vander Velde C, Vanlaer P, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Garcia G, Gul M, Poyraz D, Salva S, Schofbeck R, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Bakhshiansohi H, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, Ceard L, De Visscher S, Delaere C, Delcourt M, Forthomme L, Francois B, Giammanco A, Jafari A, Jez P, Komm M, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Alda Junior WL, Alves FL, Alves GA, Brito L, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Custodio A, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Matos Figueiredo D, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Ahuja S, Bernardes CA, Dogra S, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Moon CS, Novaes SF, Padula SS, Romeroet al., 2017, Search for anomalous Wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at √s=7 and 8 TeV, Journal of High Energy Physics, Vol: 2017, ISSN: 1029-8479

Single top quark events produced in the t channel are used to set limits on anomalous Wtb couplings and to search for top quark flavour-changing neutral current (FCNC) interactions. The data taken with the CMS detector at the LHC in proton-proton collisions at s√=7 and 8 TeV correspond to integrated luminosities of 5.0 and 19.7 fb−1, respectively. The analysis is performed using events with one muon and two or three jets. A Bayesian neural network technique is used to discriminate between the signal and backgrounds, which are observed to be consistent with the standard model prediction. The 95% confidence level (CL) exclusion limits on anomalous right-handed vector, and left- and right-handed tensor Wtb couplings are measured to be |fVR| < 0.16, |fTL| < 0.057, and − 0.049 < fTR < 0.048, respectively. For the FCNC couplings κtug and κtcg, the 95% CL upper limits on coupling strengths are |κtug|/Λ < 4.1 × 10− 3 TeV−1 and |κtcg|/Λ < 1.8 × 10− 2 TeV−1, where Λ is the scale for new physics, and correspond to upper limits on the branching fractions of 2.0 × 10−5 and 4.1 × 10−4 for the decays t → ug and t → cg, respectively.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Ero J, Flechl M, Friedl M, Fruhwirth R, Ghete VM, Hartl C, Hormann N, Hrubec J, Jeitler M, Knunz V, Konig A, Krammer M, Kratschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rahbaran B, Rohringer H, Schieck J, Schofbeck R, Strauss J, Treberer-Treberspurg W, Waltenberger W, Wulz C-E, Mossolov V, Shumeiko N, Gonzalez JS, Alderweireldt S, Cornelis T, De Wolf EA, Janssen X, Knutsson A, Lauwers J, Luyckx S, Van de Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Heracleous N, Keaveney J, Lowette S, Moreels L, Olbrechts A, Python Q, Strom D, Tavernier S, Van Doninck W, Van Mulders P, Van Onsem GP, Van Parijs I, Barria P, Brun H, Caillol C, Clerbaux B, De Lentdecker G, Fasanella G, Favart L, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Maerschalk T, Marinov A, Pernie L, Randle-conde A, Reis T, Seva T, Vander Velde C, Vanlaer P, Yonamine R, Zenoni F, Zhang F, Beernaert K, Benucci L, Cimmino A, Crucy S, Dobur D, Fagot A, Garcia G, Gul M, Mccartin J, Rios AAO, Poyraz D, Ryckbosch D, Salva S, Sigamani M, Strobbe N, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Basegmez S, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, Ceard L, Da Silveira GG, Delaere C, Favart D, Forthomme L, Giammanco A, Hollar J, Jafari A, Jez P, Komm M, Lemaitre V, Mertens A, Nuttens C, Perrini L, Pin A, Piotrzkowski K, Popov A, Quertenmont L, Selvaggi M, Marono MV, Belly N, Hammad GH, Alda Junior WL, Alves FL, Alves GA, Brito L, Correa Martins Junior M, Hamer M, Hensel C, Mora Herrera C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Custodio A, Da Costa EM, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Matos Figueiredo D, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Met al., 2017, Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV, Journal of Instrumentation, Vol: 12, Pages: 1-92, ISSN: 1748-0221

Improved jet energy scale corrections, based on a data sample corresponding to an integrated luminosity of 19.7 fb-1 collected by the CMS experiment in proton-proton collisions at a center-of-mass energy of 8 TeV, are presented. The corrections as a function of pseudorapidity η and transverse momentum pT are extracted from data and simulated events combining several channels and methods. They account successively for the effects of pileup, uniformity of the detector response, and residual data-simulation jet energy scale differences. Further corrections, depending on the jet flavor and distance parameter (jet size) R, are also presented. The jet energy resolution is measured in data and simulated events and is studied as a function of pileup, jet size, and jet flavor. Typical jet energy resolutions at the central rapidities are 15–20% at 30 GeV, about 10% at 100 GeV, and 5% at 1 TeV. The studies exploit events with dijet topology, as well as photon+jet, Z+jet and multijet events. Several new techniques are used to account for the various sources of jet energy scale corrections, and a full set of uncertainties, and their correlations, are provided.The final uncertainties on the jet energy scale are below 3% across the phase space considered by most analyses (pT;>30 GeV and 0| η| <5.). In the barrel region (| η| <1.3) an uncertainty below 1% for pT>30 GeV is reached, when excluding the jet flavor uncertainties, which are provided separately for different jet flavors. A new benchmark for jet energy scale determination at hadron colliders is achieved with 0.32% uncertainty for jets with \pt of the order of 165–330\GeV, and | η| <0.8.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Koenig A, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Treberer-Treberspurg W, Waltenberger W, Wulz C-E, Mossolov V, Shumeiko N, Gonzalez JS, Alderweireldt S, De Wolf EA, Janssen X, Lauwers J, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Heracleous N, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Caillol C, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Luetic J, Maerschalk T, Marinov A, Randle-conde A, Seva T, Velde CV, Vanlaer P, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Garcia G, Gul M, Poyraz D, Salva S, Schofbeck R, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Bakhshiansohi H, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, De Visscher S, Delaere C, Delcourt M, Francois B, Giammanco A, Jafari A, Jez P, Komm M, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Alda Junior WL, Alves FL, Alves GA, Brito L, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Custodio A, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Matos Figueiredo D, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Ahuja S, Bernardes CA, Dogra S, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Moon CS, Novaes SF, Padula SS, Romero Abad D, Ruiz Vargas JC Aet al., 2017, Search for supersymmetry in events with one lepton and multiple jets in proton-proton collisions at root s=13 TeV, Physical Review D, Vol: 95, ISSN: 2470-0010

A search for supersymmetry is performed in events with a single electron or muon in proton-proton collisions at a center-of-mass energy of 13 TeV. The data were recorded by the CMS experiment at the LHC and correspond to an integrated luminosity of 2.3  fb−1. Several exclusive search regions are defined based on the number of jets and b-tagged jets, the scalar sum of the jet transverse momenta, and the scalar sum of the missing transverse momentum and the transverse momentum of the lepton. The observed event yields in data are consistent with the expected backgrounds from standard model processes. The results are interpreted using two simplified models of supersymmetric particle spectra, both of which describe gluino pair production. In the first model, each gluino decays via a three-body process to top quarks and a neutralino, which is associated with the observed missing transverse momentum in the event. Gluinos with masses up to 1.6 TeV are excluded for neutralino masses below 600 GeV. In the second model, each gluino decays via a three-body process to two light quarks and a chargino, which subsequently decays to a W boson and a neutralino. The mass of the chargino is taken to be midway between the gluino and neutralino masses. In this model, gluinos with masses below 1.4 TeV are excluded for neutralino masses below 700 GeV.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Koenig A, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Treberer-Treberspurg W, Waltenberger W, Wulz C-E, Mossolov V, Shumeiko N, Gonzalez JS, Alderweireldt S, De Wolf EA, Janssen X, Lauwers J, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Heracleous N, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Caillol C, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Luetic J, Maerschalk T, Marinov A, Randle-conde A, Seva T, Velde CV, Vanlaer P, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Garcia G, Gul M, Poyraz D, Salva S, Schofbeck R, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Bakhshiansohi H, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, De Visscher S, Delaere C, Delcourt M, Forthomme L, Francois B, Giammanco A, Jafari A, Jez P, Komm M, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Alda Junior WL, Alves FL, Alves GA, Brito L, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Custodio A, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Figueiredo DM, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Ahuja S, Bernardes CA, Dogra S, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Moon CS, Novaes SF, Padula SS, Abad DR, Ruiz Vargas JCet al., 2017, Search for R-parity violating supersymmetry with displaced vertices in proton-proton collisions at root s=8 TeV, Physical Review D, Vol: 95, ISSN: 2470-0010

Results are reported from a search for R-parity violating supersymmetry in proton-proton collision events collected by the CMS experiment at a center-of-mass energy of √s=8  TeV. The data sample corresponds to an integrated luminosity of 17.6  fb−1. This search assumes a minimal flavor violating model in which the lightest supersymmetric particle is a long-lived neutralino or gluino, leading to a signal with jets emanating from displaced vertices. In a sample of events with two displaced vertices, no excess yield above the expectation from standard model processes is observed, and limits are placed on the pair production cross section as a function of mass and lifetime of the neutralino or gluino. At 95% confidence level, the analysis excludes cross sections above approximately 1 fb for neutralinos or gluinos with mass between 400 and 1500 GeV and mean proper decay length between 1 and 30 mm. Gluino masses are excluded below 1 and 1.3 TeV for mean proper decay lengths of 300  μm and 1 mm, respectively, and below 1.4 TeV for the range 2–30 mm. The results are also applicable to other models in which long-lived particles decay into multijet final states.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Knuenz V, Koenig A, Krammer M, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rahbaran B, Rohringer H, Schieck J, Schoefbeck R, Strauss J, Treberer-Treberspurg W, Waltenberger W, Wulz C-E, Mossolov V, Shumeiko N, Gonzalez JS, Alderweireldt S, Cornelis T, De Wolf EA, Janssen X, Knutsson A, Lauwers J, Luyckx S, Van de Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Heracleous N, Keaveney J, Lowette S, Moreels L, Olbrechts A, Python Q, Strom D, Tavernier S, Van Doninck W, Van Mulders P, Van Onsem GP, Van Parijs I, Barria P, Brun H, Caillol C, Clerbaux B, De Lentdecker G, Fasanella G, Favart L, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Maerschalk T, Marinov A, Pernie L, Randle-Conde A, Reis T, Seva T, Vander Velde C, Vanlaer P, Yonamine R, Zenoni F, Zhang F, Beernaert K, Benucci L, Cimmino A, Crucy S, Dobur D, Fagot A, Garcia G, Gul M, Mccartin J, Rios AAO, Poyraz D, Ryckbosch D, Salva S, Sigamani M, Strobbe N, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Basegmez S, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, Ceard L, Da Silveira GG, Delaere C, Favart D, Forthomme L, Giammanco A, Hollar J, Jafari A, Jez P, Komm M, Lemaitre V, Mertens A, Musich M, Nuttens C, Perrini L, Pin A, Piotrzkowski K, Popov A, Quertenmont L, Selvaggi M, Marono MV, Beliy N, Hammad GH, Alda Junior WL, Alves FL, Alves GA, Brito L, Correa Martins Junior M, Hamer M, Hensel C, Mora Herrera C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Custodio A, Da Costa EM, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Matos Figueiredo D, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznaet al., 2017, The CMS trigger system, Journal of Instrumentation, Vol: 12, Pages: 1-118, ISSN: 1748-0221

This paper describes the CMS trigger system and its performance during Run 1 of the LHC. The trigger system consists of two levels designed to select events of potential physics interest from a GHz (MHz) interaction rate of proton-proton (heavy ion) collisions. The first level of the trigger is implemented in hardware, and selects events containing detector signals consistent with an electron, photon, muon, τ lepton, jet, or missing transverse energy. A programmable menu of up to 128 object-based algorithms is used to select events for subsequent processing. The trigger thresholds are adjusted to the LHC instantaneous luminosity during data taking in order to restrict the output rate to 100 kHz, the upper limit imposed by the CMS readout electronics. The second level, implemented in software, further refines the purity of the output stream, selecting an average rate of 400 Hz for offline event storage. The objectives, strategy and performance of the trigger system during the LHC Run 1 are described.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Koenig A, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Waltenberger W, Wulz C-E, Mossolov V, Shumeiko N, Gonzalez JS, Dvornikov O, Makarenko V, Zykunov V, Alderweireldt S, De Wolf EA, Janssen X, Lauwers J, De Klundert MV, Van Haevermaet H, Van Mechelen R, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Tavernier S, Van Doninck W, Van Mulders R, Van Parijs I, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Luetic J, Maerschalk T, Marinov A, Randle-conde A, Seva T, Vander Velde C, Vanlaer R, Vannerom D, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Garcia G, Gul M, Khvastunov I, Poyraz D, Salva S, Schabeck R, Sharma A, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Bakhshiansohi H, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, De Visscher S, Delaere C, Delcourt M, Francois B, Giammanco A, Jafari A, Jez P, Komm M, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Alda Junior WL, Alves FL, Alves GA, Brito L, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Custodio A, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Matos Figueiredo D, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Santoro A, Sznajder A, Tonelli Manganote EJ, Vilela Pereira A, Ahuja S, Bernardes CA, Dogra S, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Moon CS, Novaes SF, Paduet al., 2017, Search for high-mass diphoton resonances in proton-proton collisions at 13 TeV and combination with 8 TeV search, PHYSICS LETTERS B, Vol: 767, Pages: 147-170, ISSN: 0370-2693

A search for the resonant production of high-mass photon pairs is presented. The search focuses on spin-0 and spin-2 resonances with masses between 0.5 and 4.5 TeV, and with widths, relative to the mass, between 1.4×10−41.4×10−4 and 5.6×10−25.6×10−2. The data sample corresponds to an integrated luminosity of 12.9 fb−112.9 fb−1 of proton–proton collisions collected with the CMS detector in 2016 at a center-of-mass energy of 13 TeV. No significant excess is observed relative to the standard model expectation. The results of the search are combined statistically with those previously obtained in 2012 and 2015 at View the MathML sources=8 and 13 TeV, respectively, corresponding to integrated luminosities of 19.7 and 3.3 fb−13.3 fb−1, to derive exclusion limits on scalar resonances produced through gluon–gluon fusion, and on Randall–Sundrum gravitons. The lower mass limits for Randall–Sundrum gravitons range from 1.95 to 4.45 TeV for coupling parameters between 0.01 and 0.2. These are the most stringent limits on Randall–Sundrum graviton production to date.

Journal article

Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Hartl C, Hoermann N, Hrubec J, Jeitler M, Koenig A, Kraetschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Waltenberger W, Wulz C-E, Dvornikov O, Makarenko V, Zykunov V, Mossolov V, Shumeiko N, Gonzalez JS, Alderweireldt S, De Wolf EA, Janssen X, Lauwers J, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Heracleous N, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Leonard A, Luetic J, Maer-schalk T, Marinov A, Randle-conde A, Seva T, Velde CV, Vanlaer P, Yonamine R, Zenoni F, Zhang F, Cimmino A, Cornelis T, Dobur D, Fagot A, Garcia G, Gul M, Poyraz D, Salva S, Schoefbeck R, Sharma A, Tytgat M, Van Driessche W, Yazgan E, Zaganidis N, Bakhshiansohi H, Beluffi C, Bondu O, Brochet S, Bruno G, Caudron A, De Visscher S, Delaere C, Delcourt M, Francois B, Giammanco A, Jafari A, Jez P, Komm M, Lemaitre V, Magitteri A, Mertens A, Musich M, Nuttens C, Piotrzkowski K, Quertenmont L, Selvaggi M, Marono MV, Wertz S, Beliy N, Alda WL, Alves FL, Alves GA, Brito L, Hensel C, Moraes A, Pol ME, Teles PR, Das Chagas EBB, Carvalho W, Chinellato J, Custodio A, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, De Souza SF, Guativa LMH, Malbouisson H, Figueiredo DM, Herrera CM, Mundim L, Nogima H, Da Silva WLP, Santoro A, Sznajder A, Manganote EJT, Pereira AV, Ahuja S, Bernardes CA, Dogra S, Tomei TRFP, Gregores EM, Mercadante PG, Moon CS, Novaes SF, Padula SS, Abad DR, Vargas JCR, Aleksandrov A, Hadjiiska R, Iaydjiev P, Rodozov M, Stoykova S, Sultanov G, Vutovaet al., 2017, Search for high-mass Z gamma resonances in e(+)e(-)gamma and mu(+)mu(-)gamma final states in proton-proton collisions at root s=8 and 13 TeV, Journal of High Energy Physics, Vol: 76, Pages: 1-32, ISSN: 1126-6708

This paper describes the search for a high-mass narrow-width scalar particle decaying into a Z boson and a photon. The analysis is performed using proton-proton collision data recorded with the CMS detector at the LHC at center-of-mass energies of 8 and 13 TeV, corresponding to integrated luminosities of 19.7 and 2.7 fb−1, respectively. The Z bosons are reconstructed from opposite-sign electron or muon pairs. No statistically significant deviation from the standard model predictions has been found in the 200-2000 GeV mass range. Upper limits at 95% confidence level have been derived on the product of the scalar particle production cross section and the branching fraction of the Z decaying into electrons or muons, which range from 280 to 20 fb for resonance masses between 200 and 2000 GeV.

Journal article

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