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

991 results found

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Friedl M, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van De Klundert M, Van Haevermaet H, Van Mechelen R, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Bruyn I, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilin B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Starling E, Vander Velde C, Vanlaer R, Vannerom D, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, David R, Delaere C, Delcourt M, Francois B, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Piotrzkowski K, Saggio A, Marono MV, Wertz S, Zobec J, Alves FL, Alves GA, Brito L, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles R, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Calligaris L, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula SS, Romero Abad D, Aleksandrov A, Hadjiiska R, Iaydjiev R, Marinov A, Misheva M, Rodozoet al., 2019, Measurement of prompt psi(2S) production cross sections in proton-lead and proton-proton collisions at root s(NN)=5.02 TeV, Physics Letters B, Vol: 790, Pages: 509-532, ISSN: 0370-2693

Measurements of prompt meson production cross sections in proton–lead (pPb) and proton–proton (pp) collisions at a nucleon–nucleon center-of-mass energy of are reported. The results are based on pPb and pp data collected by the CMS experiment at the LHC, corresponding to integrated luminosities of 34.6 and 28.0 , respectively. The nuclear modification factor is measured for prompt in the transverse momentum range and the center-of-mass rapidity range . The results on are compared to the corresponding modification factor for prompt mesons. The results point to different nuclear effects at play in the production of the excited charmonium state compared to the ground state, in the region of backward rapidity and for .

Journal article

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Eroe J, Escalante Del Valle A, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Suarez Gonzalez J, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Lelek A, Pieters M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilin B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Wang Q, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Bruno G, Caputo C, David P, Delaere C, Delcourt M, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Piotrzkowski K, Saggio A, Vidal Marono M, Vischia P, Zobec J, Alves FL, Alves GA, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Calligaris L, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula S, Aleksandrov A, Hadjiiska R, Iaydjiev P, Marinov A, Misheva M, Rodozov M, Shopova M, Sultanov G, Dimitrov A, Litov L, Pavlov B, Petkov P, Fanget al., 2019, Inclusive search for supersymmetry in pp collisions at root s=13 TeV using razor variables and boosted object identification in zero and one lepton final states, Journal of High Energy Physics, Vol: 2019, ISSN: 1029-8479

An inclusive search for supersymmetry (SUSY) using the razor variables is performed using a data sample of proton-proton collisions corresponding to an integrated luminosity of 35.9 fb−1, collected with the CMS experiment in 2016 at a center-of-mass energy of s√=13 TeV. The search looks for an excess of events with large transverse energy, large jet multiplicity, and large missing transverse momentum. The razor kinematic variables are sensitive to large mass differences between the parent particle and the invisible particles of a decay chain and help to identify the presence of SUSY particles. The search covers final states with zero or one charged lepton and features event categories divided according to the presence of a high transverse momentum hadronically decaying W boson or top quark, the number of jets, the number of b-tagged jets, and the values of the razor kinematic variables, in order to separate signal from background for a broad range of SUSY signatures. The addition of the boosted W boson and top quark categories within the analysis further increases the sensitivity of the search, particularly to signal models with large mass splitting between the produced gluino or squark and the lightest SUSY particle. The analysis is interpreted using simplified models of R-parity conserving SUSY, focusing on gluino pair production and top squark pair production. Limits on the gluino mass extend to 2.0 TeV, while limits on top squark mass reach 1.14 TeV.

Journal article

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilin B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Wang Q, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, David P, Delaere C, Delcourt M, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Piotrzkowski K, Saggio A, Marono MV, Wertz S, Zobec J, Alves FL, Alves GA, Correa Martins Junior M, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Calligaris L, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula SS, Aleksandrov A, Hadjiiska R, Iaydjiev P, Marinov A, Misheva M, Rodozov M, Shopova M, Sultanov G, Dimitrov A, Litet al., 2019, Search for pair production of first-generation scalar leptoquarks at root s=13 TeV, Physical Review D, Vol: 99, ISSN: 2470-0010

A search for the pair production of first-generation scalar leptoquarks is performed using proton-proton collision data recorded at 13 TeV center-of-mass energy with the CMS detector at the LHC. The data correspond to an integrated luminosity of 35.9  fb−1. The leptoquarks are assumed to decay promptly to a quark and either an electron or a neutrino, with branching fractions β and 1−β, respectively. The search targets the decay final states comprising two electrons, or one electron and large missing transverse momentum, along with two quarks that are detected as hadronic jets. First-generation scalar leptoquarks with masses below 1435 (1270) GeV are excluded for β=1.0(0.5). These are the most stringent limits on the mass of first-generation scalar leptoquarks to date. The data are also interpreted to set exclusion limits in the context of an R-parity violating supersymmetric model, predicting promptly decaying top squarks with a similar dielectron final state.

Journal article

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Bruyn I, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilin B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Wang Q, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, David P, Delaere C, Delcourt M, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Piotrzkowski K, Saggio A, Marono MV, Wertz S, Zobec J, Alves FL, Alves GA, Correa Martins Junior M, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Calligaris L, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula SS, Aleksandrov A, Hadjiiska R, Iaydjiev P, Marinov A, Misheva M, Rodozov M, Shopoet al., 2019, Search for Narrow Hγ gamma Resonances in Proton-Proton Collisions at root s=13 TeV, Physical Review Letters, Vol: 122, ISSN: 0031-9007

A search for heavy, narrow resonances decaying to a Higgs boson and a photon (Hγ) has been performed in proton-proton collision data at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1 collected with the CMS detector at the LHC in 2016. Events containing a photon and a Lorentz-boosted hadronically decaying Higgs boson reconstructed as a single, large-radius jet are considered, and the γ+ jet invariant mass spectrum is analyzed for the presence of narrow resonances. To increase the sensitivity of the search, events are categorized depending on whether or not the large-radius jet can be identified as a result of the merging of two jets originating from b quarks. Results in both categories are found to agree with the predictions of the standard model. Upper limits on the production rate of Hγ resonances are set as a function of their mass in the range of 720–3250 GeV, representing the most stringent constraints to date.

Journal article

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Ero J, Del Valle AE, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van de Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Bruyn I, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilin B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Wang Q, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, David P, Delaere C, Delcourt M, Francois B, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Piotrzkowski K, Saggio A, Marono MV, Wertz S, Zobec J, Alves FL, Alves GA, Brito L, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, Martins CDO, De Souza SF, Malbouisson H, Figueiredo DM, De Almeida MM, Herrera CM, Mundim L, Nogima H, Da Silva WLP, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ayala E, Jarrin EC, Kamel AE, Mahrous A, Mohammed Y, Bhowmik S, De Oliveira ACA, Dewanjee RK, Ehataht K, Kadastik M, Raidal M, Veelken C, Eerola P, Kirschenmann H, Pekkanen J, Voutilainen M, Havukainen J, Heikkilet al., 2019, Search for top quark partners with charge 5/3 in the same-sign dilepton and single-lepton final states in proton-proton collisions at √=13 TeV, Journal of High Energy Physics, Vol: 2019, ISSN: 1029-8479

A search for the pair production of heavy fermionic partners of the top quark with charge 5/3 (X5/3) is performed in proton-proton collisions at a center-of-mass energy of 13 TeV with the CMS detector at the CERN LHC. The data sample analyzed corresponds to an integrated luminosity of 35.9 fb−1. The X5/3 quark is assumed always to decay into a top quark and a W boson. Both the right-handed and left-handed X5/3 couplings to the W boson are considered. Final states with either a pair of same-sign leptons or a single lepton are studied. No significant excess of events is observed above the expected standard model background. Lower limits at 95% confidence level on the X5/3 quark mass are set at 1.33 and 1.30 TeV respectively for the case of right-handed and left-handed couplings to W bosons in a combination of the same-sign dilepton and single-lepton final states.

Journal article

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Zeid SA, Blekman F, D'Hondt J, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilin B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Postiau N, Starling E, Thomas L, Velde CV, Vanlaer P, Vannerom D, Wang Q, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, David P, Delaere C, Delcourt M, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Piotrzkowski K, Saggio A, Marono MV, Wertz S, Zobec J, Alves FL, Alves GA, Junior MCM, Silva GC, Hensel C, Moraes A, Pol ME, Teles PR, Chagas EBBD, Carvalho W, Chinellato J, Coelho E, Costa EMD, Silveira GGD, Damiao DDJ, Martins CDO, De Souza SF, Malbouisson H, Figueiredo DM, De Almeida MM, Herrera CM, Mundim L, Nogima H, Da Silva WLP, Rosas LJS, Santoro A, Sznajder A, Thiel M, Manganote EJT, De Araujo FTDS, Pereira AV, Ahuja S, Bernardes CA, Calligaris L, Tomei TRFP, Gregores EM, Mercadante PG, Novaes SF, Padula S, Aleksandrov A, Hadjiiska R, Iaydjiev P, Marinov A, Misheva M, Rodozov M, Shopova M, Sultanov G, Dimitrov A, Litov L, Pavlov B, Petkov P, Fang W, Gao X, Yuan L, Ahmad M, Bian JG, Chen GM, Chen HS, Chen M, Chen Y, Jiang CH, Leggat D, Liao H, Liu Z Ret al., 2019, Search for dark matter produced in association with a Higgs boson decaying to a pair of bottom quarks in proton-proton collisions at √s =13TeV, European Physical Journal C: Particles and Fields, Vol: 79, ISSN: 1434-6044

A search for dark matter produced in association with a Higgs boson decaying to a pair of bottom quarks is performed in proton–proton collisions at a center-of-mass energy of 13 TeV collected with the CMS detector at the LHC. The analyzed data sample corresponds to an integrated luminosity of 35.9 fb−1 . The signal is characterized by a large missing transverse momentum recoiling against a bottom quark–antiquark system that has a large Lorentz boost. The number of events observed in the data is consistent with the standard model background prediction. Results are interpreted in terms of limits both on parameters of the type-2 two-Higgs doublet model extended by an additional light pseudoscalar boson a (2HDM+ a ) and on parameters of a baryonic Z′ simplified model. The 2HDM+ a model is tested experimentally for the first time. For the baryonic Z′ model, the presented results constitute the most stringent constraints to date.

Journal article

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Grossmann J, Hrubec J, Jeitler M, Koenig A, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Pree E, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van de Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Bruyn I, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilin B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Maerschalk T, Seva T, Starling E, Vander Velde C, Vanlaer P, Vannerom D, Yonamine R, Zenoni F, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, Caudron A, David P, De Visscher S, Delaere C, Delcourt M, Francois B, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Piotrzkowski K, Quertenmont L, Saggio A, Marono MV, Wertz S, Zobec J, Alda Junior WL, Alves FL, Alves GA, Brito L, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula SS, Romeroet al., 2019, Search for a heavy resonance decaying to a top quark and a vector-like top quark in the lepton plus jets final state in pp collisions at root s=13 TeV, European Physical Journal C: Particles and Fields, Vol: 79, ISSN: 1434-6044

A search is presented for a heavy spin-1 resonance Z′ decaying to a top quark and a vector-like top quark partner T in the lepton + jets final state. The search is performed using a data set of p p collisions at a centre-of-mass energy of 13TeV corresponding to an integrated luminosity of 35.9fb−1 as recorded by the CMS experiment at the CERN LHC in the year 2016. The analysis is optimised for final states arising from the T decay modes to a top quark and a Higgs or Z boson (T→Ht,Zt). The event selection makes use of resolved and merged top quark decay products, as well as decays of boosted Higgs bosons and Z and W bosons using jet substructure techniques. No significant deviation from the standard model background expectation is observed. Exclusion limits on the product of the cross section and branching fraction for Z′→tT,T→Ht,Zt,Wb are presented for various combinations of the Z′ resonance mass and the vector-like T quark mass. These results represent the most stringent limits to date for the decay mode Z′→tT→tHt. In a benchmark model with extra dimensions, invoking a heavy spin-1 resonance G∗, masses of the G∗ between 1.5 and 2.3TeV and between 2.0 and 2.4TeV are excluded for T masses of 1.2 and 1.5TeV, respectively.

Journal article

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Grossmann J, Hrubec J, Jeitler M, Koenig A, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Pree E, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van de Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Bruyn I, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilin B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Maerschalk T, Seva T, Starling E, Vander Velde C, Vanlaer P, Vannerom D, Yonamine R, Zenoni F, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, Caudron A, David P, De Visscher S, Delaere C, Delcourt M, Francois B, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Piotrzkowski K, Quertenmont L, Saggio A, Marono MV, Wertz S, Zobec J, Alda Junior WL, Alves FL, Alves GA, Brito L, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula SS, Romeroet al., 2019, Search for t(t)over-barH production in the H -> b(b)over-bar decay channel with leptonic t(t)over-bar decays in proton-proton collisions at root s=13 TeV, Journal of High Energy Physics, Vol: 2019, ISSN: 1029-8479

A search is presented for the associated production of a standard model Higgs boson with a top quark-antiquark pair (tt⎯⎯H), in which the Higgs boson decays into a b quark-antiquark pair, in proton-proton collisions at a centre-of-mass energy √=13 TeV. The data correspond to an integrated luminosity of 35.9 fb−1 recorded with the CMS detector at the CERN LHC. Candidate tt⎯⎯H events are selected that contain either one or two electrons or muons from the tt⎯⎯ decays and are categorised according to the number of jets. Multivariate techniques are employed to further classify the events and eventually discriminate between signal and background. The results are characterised by an observed tt⎯⎯H signal strength relative to the standard model cross section, μ = σ/σSM, under the assumption of a Higgs boson mass of 125 GeV. A combined fit of multivariate discriminant distributions in all categories results in an observed (expected) upper limit on μ of 1.5 (0.9) at 95% confidence level, and a best fit value of 0.72 ± 0.24(stat) ± 0.38(syst), corresponding to an observed (expected) signal significance of 1.6 (2.2) standard deviations above the background-only hypothesis.

Journal article

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilin B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Wang Q, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, David P, Delaere C, Delcourt M, Francois B, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Piotrzkowski K, Saggio A, Marono MV, Wertz S, Zobec J, Alves FL, Alves GA, Correa Martins M, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Calligaris L, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula S, Aleksandrov A, Hadjiiska R, Iaydjiev P, Marinov A, Misheva M, Rodozov M, Shopova M, Sultanov G, Dimitrov A, Litov Let al., 2019, Search for a W' boson decaying to a vector-like quark and a top or bottom quark in the all-jets final state, Journal of High Energy Physics, Vol: 2019, ISSN: 1029-8479

A search for a heavy W′ resonance decaying to one B or T vector-like quark and a top or bottom quark, respectively, is presented. The search uses proton-proton collision data collected in 2016 with the CMS detector at the LHC, corresponding to an integrated luminosity of 35.9 fb−1 at s√=13 TeV. Both decay channels result in a final state with a top quark, a Higgs boson, and a b quark, each produced with significant energy. The all-hadronic decays of both the Higgs boson and the top quark are considered. The final-state jets, some of which correspond to merged decay products of a boosted top quark and a Higgs boson, are selected using jet substructure techniques, which help to suppress standard model backgrounds. A W′ boson signal would appear as a narrow peak in the invariant mass distribution of these jets. No significant deviation in data with respect to the standard model background predictions is observed. Cross section upper limits on W′ boson production in the top quark, Higgs boson, and b quark decay mode are set as a function of the W′ mass, for several vector-like quark mass hypotheses. These are the first limits for W′ boson production in this decay channel, and cover a range of 0.01 to 0.43 pb in the W′ mass range between 1.5 and 4.0 TeV.

Journal article

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van de Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilin B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Wang Q, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, David P, Delaere C, Delcourt M, Francois B, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Piotrzkowski K, Saggio A, Marono MV, Wertz S, Zobec J, Alves FL, Alves GA, Correa Martins Junior M, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Calligaris L, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula SS, Aleksandrov A, Hadjiiska R, Iaydjiev P, Marinov A, Mishevaet al., 2019, Measurements of t(t)over-bar differential cross sections in proton-proton collisions at root s=13 TeV using events containing two leptons, Journal of High Energy Physics, Vol: 2019, ISSN: 1029-8479

Measurements of differential top quark pair tt¯ cross sections using events produced in proton-proton collisions at a centre-of-mass energy of 13 TeV containing two oppositely charged leptons are presented. The data were recorded by the CMS experiment at the CERN LHC in 2016 and correspond to an integrated luminosity of 35.9 fb−1. The differential cross sections are presented as functions of kinematic observables of the top quarks and their decay products, the tt¯ system, and the total number of jets in the event. The differential cross sections are defined both with particle-level objects in a fiducial phase space close to that of the detector acceptance and with parton-level top quarks in the full phase space. All results are compared with standard model predictions from Monte Carlo simulations with next-to-leading-order (NLO) accuracy in quantum chromodynamics (QCD) at matrix-element level interfaced to parton-shower simulations. Where possible, parton-level results are compared to calculations with beyond-NLO precision in QCD. Significant disagreement is observed between data and all predictions for several observables. The measurements are used to constrain the top quark chromomagnetic dipole moment in an effective field theory framework at NLO in QCD and to extract tt¯ and leptonic charge asymmetries.

Journal article

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Grossmann J, Hrubec J, Jeitler M, Koenig A, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Pree E, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Bruyn I, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Lenzi T, Luetic J, Maerschalk T, Marinov A, Seva T, Starling E, 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, Roskas C, Salva S, Tytgat M, Verbeke W, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, Caudron A, David P, De Visscher S, Delaere C, Delcourt M, Francois B, Giammanco A, Komm M, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Piotrzkowski K, Quertenmont L, Saggio A, Marono MV, Wertz S, Zobec J, 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, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula SS, Romero Abad D, Ruiz Vaet al., 2019, Non-Gaussian elliptic-flow fluctuations in PbPb collisions at root S-NN=5.02 TeV, Physics Letters B, Vol: 789, Pages: 643-665, ISSN: 0370-2693

Event-by-event fluctuations in the elliptic-flow coefficient are studied in PbPb collisions at  TeV using the CMS detector at the CERN LHC. Elliptic-flow probability distributions for charged particles with transverse momentum and pseudorapidity are determined for different collision centrality classes. The moments of the distributions are used to calculate the coefficients based on cumulant orders 2, 4, 6, and 8. A rank ordering of the higher-order cumulant results and nonzero standardized skewness values obtained for the distributions indicate non-Gaussian initial-state fluctuations. Bessel–Gaussian and elliptic power fits to the flow distributions are studied to characterize the initial-state spatial anisotropy.

Journal article

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Bruyn I, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilin B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Wang Q, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, David P, Delaere C, Delcourt M, Francois B, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Piotrzkowski K, Saggio A, Marono MV, Wertz S, Zobec J, Alves FL, Alves GA, Correa Martins Junior M, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Calligaris L, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula SS, Romero Abad D, Aleksandrov A, Hadjiiska R, Iaydet al., 2019, Measurement of differential cross sections for Z boson pair production in association with jets at root s=8 and 13 TeV, Physics Letters B, Vol: 789, Pages: 19-44, ISSN: 0370-2693

This Letter reports measurements of differential cross sections for the production of two Z bosons in association with jets in proton–proton collisions at and 13 TeV. The analysis is based on data samples collected at the LHC with the CMS detector, corresponding to integrated luminosities of 19.7 and 35.9 at 8 and 13 TeV, respectively. The measurements are performed in the leptonic decay modes , where . The differential cross sections as a function of the jet multiplicity, the transverse momentum , and pseudorapidity of the -leading and subleading jets are presented. In addition, the differential cross sections as a function of variables sensitive to the vector boson scattering, such as the invariant mass of the two -leading jets and their pseudorapidity separation, are reported. The results are compared to theoretical predictions and found in good agreement within the theoretical and experimental uncertainties.

Journal article

d'Enterria D, Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, Dhondt J, De Bruyn I, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilm B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, David P, Delaere C, Delcourt M, Francois B, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Piotrzkowski K, Saggio A, Marono MV, Wertz S, Zobec J, Alves FL, Alves GA, Correa Martins Junior M, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Calligaris L, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula SS, Aleksandrov A, Hadjiiska R, Iaydjiev P, Maret al., 2019, Evidence for light-by-light scattering in ultraperipheral PbPb collisions at root S-NN=5.02 TeV, Nuclear Physics A, Vol: 982, Pages: 791-794, ISSN: 0375-9474

Evidence for light-by-light (LbL) scattering, , in ultraperipheral PbPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV is reported. LbL scattering processes are selected in events with just two photons produced, with transverse energy , pseudorapidity ; and diphoton invariant mass , transverse momentum , and acoplanarity . After all selection criteria, 14 events are observed, compared to and events expected for signal and background processes respectively. The significance of the signal excess over the background-only hypothesis is 4.1σ. The measured fiducial LbL scattering cross section, nb is consistent with the standard model prediction.

Journal article

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Lelek A, Pieters M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilin B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Wang Q, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, David P, Delaere C, Delcourt M, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Piotrzkowski K, Saggio A, Marono MV, Vischia P, Wertz S, Zobec J, Alves FL, Alves GA, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Calligaris L, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula SS, Aleksandrov A, Hadjiiska R, Iaydjiev P, Marinov A, Misheva M, Rodozov M, Shopova M, Sultanov G, Dimitrov A, Litov L, Pavlov B, Petkov P, Fanet al., 2019, Search for long-lived particles decaying into displaced jets in proton-proton collisions at root s=13 TeV, Physical Review D, Vol: 99, ISSN: 2470-0010

A search for long-lived particles decaying into jets is presented. Data were collected with the CMS detector at the LHC from proton-proton collisions at a center-of-mass energy of 13 TeV in 2016, corresponding to an integrated luminosity of 35.9  fb−1. The search examines the distinctive topology of displaced tracks and secondary vertices. The selected events are found to be consistent with standard model predictions. For a simplified model in which long-lived neutral particles are pair produced and decay to two jets, pair production cross sections larger than 0.2 fb are excluded at 95% confidence level for a long-lived particle mass larger than 1000 GeV and proper decay lengths between 3 and 130 mm. Several supersymmetry models with gauge-mediated supersymmetry breaking or R-parity violation, where pair-produced long-lived gluinos or top squarks decay to several final-state topologies containing displaced jets, are also tested. For these models, in the mass ranges above 200 GeV, gluino masses up to 2300–2400 GeV and top squark masses up to 1350–1600 GeV are excluded for proper decay lengths approximately between 10 and 100 mm. These are the most restrictive limits to date on these models.

Journal article

Shi Z, Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, Dhondt J, De Bruyn I, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilm B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, David P, Delaere C, Delcourt M, Francois B, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Piotrzkowski K, Saggio A, Marono MV, Wertz S, Zobec J, Alves FL, Alves GA, Correa Martins Junior M, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Calligaris L, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula SS, Aleksandrov A, Hadjiiska R, Iaydjiev P, Marinov Aet al., 2019, D-0-Meson R-AA in PbPb Collisions at root s(NN)=5.02 TeV and Elliptic Flow in pPb Collisions at root s(NN)=8.16 TeV with CMS, Nuclear Physics A, Vol: 982, Pages: 647-650, ISSN: 0375-9474

The study of charm production in heavy-ion collisions is considered an excellent probe for the properties of the hot and dense medium created in heavy-ion collisions. Measurements of D0-meson nuclear modification factor can provide strong constraints into the mechanisms of in-medium energy loss and charm flow in the medium. The measurement of D0-meson elliptic flow in pPb collisions helps us understand the strength of charm quarks coupling to significantly reduced systems which demonstrate hydrodynamic properties. In this paper, the measurements of the D0-meson nuclear modification factor in PbPb collisions at 5.02 TeV together with the new measurement of D0-meson elliptic flow in high multiplicity pPb collisions at 5.02 TeV using the two-particle correlation method will be presented.

Journal article

Diab B, Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Suarez Gonzalez J, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van de Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Bruyn I, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilm B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Wang Q, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, David P, Delaere C, Delcourt M, Francois B, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Piotrzkowski K, Saggio A, Marono MV, Wertz S, Zobec J, Alves FL, Alves GA, Correa Martins Junior M, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Calligaris L, Tomei TRFP, Gregores EM, Mercadante PG, Novaes SF, Padula SS, Aleksandrov A, Hadjiiska R, Iaydjiev P, Marinovet al., 2019, Fragmentation of J/psi in jets in pp collisions at root s=5.02 TeV, Nuclear Physics A, Vol: 982, Pages: 186-188, ISSN: 0375-9474

The fragmentation of jets containing a J/ψ meson is studied in pp data using an integrated luminosity of . The fraction of the jet transverse momentum pT,jet carried by the J/ψ is measured for prompt J/ψ and J/ψ coming from b hadron decays, named nonprompt. Whereas the fragmentation function of nonprompt J/ψ is well-modeled by simulations using a Monte Carlo generator, the prompt J/ψ are found to be accompanied by a larger level of jet activity. The fraction of J/ψ mesons that are produced inside a jet is also reported, and found to be larger in data than in simulation, for both prompt and nonprompt J/ψ.

Journal article

Tu Z, Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Suarez Gonzalez J, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van de Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Bruyn I, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilm B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Wang Q, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, David P, Delaere C, Delcourt M, Francois B, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Piotrzkowski K, Saggio A, Marono MV, Wertz S, Zobec J, Alves FL, Alves GA, Correa Martins Junior M, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Calligaris L, Tomei TRFP, Gregores EM, Mercadante PG, Novaes SF, Padula SS, Aleksandrov A, Hadjiiska R, Iaydjiev P, Marinov Aet al., 2019, Search for the chiral magnetic effect at the LHC with the CMS experiment, Nuclear Physics A, Vol: 982, Pages: 527-530, ISSN: 0375-9474

Searches for the chiral magnetic effect (CME) using charge-dependent azimuthal correlations with respect to event planes are presented in PbPb collisions at 5.02 TeV and pPb collisions at 5.02 and 8.16 TeV, with the CMS experiment at the LHC. The azimuthal correlations with respect to the second- and third-order event planes are explored as a function of pseudorapidity, transverse momentum, and event multiplicity, which provides new insights into the underlying background correlations. By employing an event-shape engineering technique, a linear dependence of charge-dependent correlations on the second-order anisotropy flow (ν2) is observed, and the upper limits on the ν2-independent fraction, which is directly related to the CME signal, are obtained at 95% confidence level for both pPb and PbPb collisions. These results provide strong constraints on the search for the chiral magnetic effect at LHC energies, and establish new guidelines for searches in future experiments.

Journal article

Wang Q, Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, Dhondt J, De Bruyn I, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilm B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, David P, Delaere C, Delcourt M, Francois B, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Piotrzkowski K, Saggio A, Marono MV, Wertz S, Zobec J, Alves FL, Alves GA, Correa Martins Junior M, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Calligaris L, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula SS, Aleksandrov A, Hadjiiska R, Iaydjiev P, Marinov Aet al., 2019, Multiparticle correlations and higher order harmonics in pPb collisions at root s(NN)=8.16 TeV, Nuclear Physics A, Vol: 982, Pages: 375-378, ISSN: 0375-9474

The elliptic and higher-order azimuthal anisotropy Fourier harmonics (vn) are obtained for pPb collisions at over a wide range of event multiplicities based on multiparticle correlations. The data were collected by the CMS experiment during the 2016 LHC run. A sample of peripheral PbPb collisions at covering a similar range of event multiplicities to the pPb results is also analyzed for comparison. The ratios of different harmonic moments are obtained for both v2 and v3 with high precision, which allows a direct comparison to theoretical predictions assuming a hydrodynamic evolution of the created medium with initial-state density fluctuations, particularly probing the non-Gaussian nature of initial-state fluctuations in small collision systems. The presented results provide crucial insights into the origin of collective long-range correlations observed in small collision systems.

Journal article

Oh G, Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, Dhondt J, De Bruyn I, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilm B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, David P, Delaere C, Delcourt M, Francois B, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Piotrzkowski K, Saggio A, Marono MV, Wertz S, Zobec J, Alves FL, Alves GA, Correa Martins Junior M, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Calligaris L, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula SS, Aleksandrov A, Hadjiiska R, Iaydjiev P, Marinov Aet al., 2019, Beyond nPDFs effects : Prompt J/psi and psi(2S) production in pPb and pp collisions, Nuclear Physics A, Vol: 982, Pages: 743-746, ISSN: 0375-9474

A multi-dimensional analysis of prompt charmonia in pp and pPb collisions at with the CMS detector is presented. The pPb differential cross-sections of prompt J/ψ are shown in a wide kinematic region, for transverse momentum pT spanning from 2 to 30 GeV/c and a rapidity interval between -2.4 to 1.93 in the center of mass of the collision. The final results on prompt ψ(2S) meson production cross section in pp and pPb collisions at 5.02 TeV are also reported as a function of pT and rapidity, for pT from 4 to 30 GeV/c. The nuclear modification factor is found to be smaller than that of prompt J/ψ in all measured bins, especially at low pT and at backward rapidity. Such a different behaviour between the ground and excited states cannot be reproduced considering nPDF effects alone.

Journal article

Stojanovic M, Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Suarez Gonzalez J, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van de Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Bruyn I, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilm B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Wang Q, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, David P, Delaere C, Delcourt M, Francois B, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Piotrzkowski K, Saggio A, Marono MV, Wertz S, Zobec J, Alves FL, Alves GA, Correa Martins Junior M, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Calligaris L, Tomei TRFP, Gregores EM, Mercadante PG, Novaes SF, Padula SS, Aleksandrov A, Hadjiiska R, Iaydjiev P, Maet al., 2019, Measurement of anisotropic flow in XeXe collisions at 5.44 TeV with the CMS experiment, Nuclear Physics A, Vol: 982, Pages: 395-398, ISSN: 0375-9474

New measurements of anisotropic flow in XeXe collisions at a center-of-mass energy of 5.44 TeV per nucleon pair, collected by the CMS experiment at the LHC, are presented. The ν2, ν3 and ν4 Fourier coefficients of the anisotropic azimuthal distribution are obtained employing three different analysis techniques: two-particle correlations, the scalar product method, and multiparticle cumulants, which have different sensitivities to non-flow and flow fluctuation effects. The results are shown as a function of transverse momentum (pT) for various centrality selections, and compared with corresponding results from PbPb collisions. These new measurements in a smaller nucleus-nucleus system than PbPb provide additional insights into the system-size dependence of the collective flow induced by the dominant collision geometry and its fluctuations. In particular, these results, compared to theoretical predictions and Monte Carlo generators, will provide important details on the system size dependence of the medium response in heavy ion collisions. They also offer a unique opportunity to study the onset of flow from small to large systems.

Journal article

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Bruyn I, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilin B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Wang Q, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, David P, Delaere C, Delcourt M, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Piotrzkowski K, Saggio A, Marono MV, Wertz S, Zobec J, Alves FL, Alves GA, Correa Martins Junior M, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Calligaris L, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula SS, Aleksandrov A, Hadjiiska R, Iaydjiev P, Marinov A, Misheva M, Rodozov M, Shopova M, Sultet al., 2019, Search for pair production of second-generation leptoquarks at √s =13 TeV, Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol: 99, ISSN: 1550-2368

A search for pair production of second-generation leptoquarks is performed using proton-proton collision data collected at √s = 13 TeV in 2016 with the CMS detector at the CERN LHC, corresponding to an integrated luminosity of 35.9 fb−1. Final states with two muons and two jets, or with one muon, two jets, and missing transverse momentum are considered. Second-generation scalar leptoquarks with masses less than 1530(1285) GeV are excluded for β = 1.0(0.5), where β is the branching fraction for the decay of a leptoquark to a charged lepton and a quark. The results of the search are also interpreted as limits on the pair production of long-lived top squarks in an R-parity violating supersymmetry model that has a final state with two muons and two jets. These limits represent the most stringent limits to date on these models.

Journal article

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilin B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Wang Q, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, David P, Delaere C, Delcourt M, Francois B, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Piotrzkowski K, Saggio A, Marono MV, Wertz S, Zobec J, Alves FL, Alves GA, Correa Martins M, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Calligaris L, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula S, Aleksandrov A, Hadjiiska R, Iaydjiev P, Marinov A, Misheva M, Rodozov M, Shopova M, Sultanov G, Dimitrov A, Litov Let al., 2019, Search for new physics in final states with a single photon and missing transverse momentum in proton-proton collisions at √=13TeV, Journal of High Energy Physics, Vol: 2019, ISSN: 1029-8479

A search is conducted for new physics in final states containing a photon and missing transverse momentum in proton-proton collisions at √=13 TeV, using the data collected in 2016 by the CMS experiment at the LHC, corresponding to an integrated luminosity of 35.9 fb−1. No deviations from the predictions of the standard model are observed. The results are interpreted in the context of dark matter production and models containing extra spatial dimensions, and limits on new physics parameters are calculated at 95% confidence level. For the two simplified dark matter production models considered, the observed (expected) lower limits on the mediator masses are both 950 (1150) GeV for 1 GeV dark matter mass. For an effective electroweak-dark matter contact interaction, the observed (expected) lower limit on the suppression parameter Λ is 850 (950) GeV. Values of the effective Planck scale up to 2.85–2.90 TeV are excluded for between 3 and 6 extra spatial dimensions.

Journal article

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Bruyn I, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilin B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Wang Q, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, David P, Delaere C, Delcourt M, Francois B, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Piotrzkowski K, Saggio A, Marono MV, Wertz S, Zobec J, Alves FL, Alves GA, Brito L, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Calligaris L, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula S, Romero Abad D, Aleksandrov A, Hadjiiska R, Iaydjiev P, Marinoet al., 2019, Study of the underlying event in top quark pair production in pp collisions at 13 TeV, The European Physical Journal C - Particles and Fields, Vol: 79, ISSN: 1434-6044

Measurements of normalized differential cross sections as functions of the multiplicity and kinematic variables of charged-particle tracks from the underlying event in top quark and antiquark pair production are presented. The measurements are performed in proton-proton collisions at a center-of-mass energy of 13 TeV , and are based on data collected by the CMS experiment at the LHC in 2016 corresponding to an integrated luminosity of 35.9 fb−1 . Events containing one electron, one muon, and two jets from the hadronization and fragmentation of b quarks are used. These measurements characterize, for the first time, properties of the underlying event in top quark pair production and show no deviation from the universality hypothesis at energy scales typically above twice the top quark mass.

Journal article

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Eroe J, Escalante Del Valle A, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Suarez Gonzalez J, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilin B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Wang Q, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, David P, Delaere C, Delcourt M, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Piotrzkowski K, Saggio A, Vidal Marono M, Wertz S, Zobec J, Alves FL, Alves GA, Correa Martins Junior M, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Calligaris L, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula S, Aleksandrov A, Hadjiiska R, Iaydjiev P, Marinov A, Misheva M, Rodozov M, Shopovaet al., 2019, Search for new particles decaying to a jet and an emerging jet, Journal of High Energy Physics, Vol: 2019, ISSN: 1029-8479

A search is performed for events consistent with the pair production of a new heavy particle that acts as a mediator between a dark sector and normal matter, and that decays to a light quark and a new fermion called a dark quark. The search is based on data corresponding to an integrated luminosity of 16.1 fb−1 from proton-proton collisions at √=13 TeV collected by the CMS experiment at the LHC in 2016. The dark quark is charged only under a new quantum-chromodynamics-like force, and forms an “emerging jet” via a parton shower, containing long-lived dark hadrons that give rise to displaced vertices when decaying to standard model hadrons. The data are consistent with the expectation from standard model processes. Limits are set at 95% confidence level excluding dark pion decay lengths between 5 and 225 mm for dark mediators with masses between 400 and 1250 GeV. Decay lengths smaller than 5 and greater than 225 mm are also excluded in the lower part of this mass range. The dependence of the limit on the dark pion mass is weak for masses between 1 and 10 GeV. This analysis is the first dedicated search for the pair production of a new particle that decays to a jet and an emerging jet.

Journal article

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilin B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Wang Q, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, David P, Delaere C, Delcourt M, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Piotrzkowski K, Saggio A, Marono MV, Wertz S, Zobec J, Alves FL, Alves GA, Correa Martins Junior M, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Calligaris L, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula SS, Aleksandrov A, Hadjiiska R, Iaydjiev P, Marinov A, Misheva M, Rodozov M, Shopova M, Sultanov G, Dimiet al., 2019, Search for single production of vector-like quarks decaying to a top quark and a W boson in proton-proton collisions at TeV, European Physical Journal C: Particles and Fields, Vol: 79, ISSN: 1434-6044

A search is presented for the single production of vector-like quarks in proton–proton collisions at √=13TeV. The data, corresponding to an integrated luminosity of 35.9fb−1, were recorded with the CMS experiment at the LHC. The analysis focuses on the vector-like quark decay into a top quark and a W boson, with one muon or electron in the final state. The mass of the vector-like quark candidate is reconstructed from hadronic jets, the lepton, and the missing transverse momentum. Methods for the identification of b quarks and of highly Lorentz boosted hadronically decaying top quarks and W bosons are exploited in this search. No significant deviation from the standard model background expectation is observed. Exclusion limits at 95% confidence level are set on the product of the production cross section and branching fraction as a function of the vector-like quark mass, which range from 0.3 to 0.03pb for vector-like quark masses of 700 to 2000GeV. Mass exclusion limits up to 1660GeV are obtained, depending on the vector-like quark type, coupling, and decay width. These represent the most stringent exclusion limits for the single production of vector-like quarks in this channel.

Journal article

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Bruyn I, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilin B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Wang Q, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, David P, Delaere C, Delcourt M, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Piotrzkowski K, Saggio A, Marono MV, Wertz S, Zobec J, Alves FL, Alves GA, Correa Martins M, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Calligaris L, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula SS, Aleksandrov A, Hadjiiska R, Iaydjiev P, Marinov A, Misheva M, Rodozov M, Shopova M Set al., 2019, Search for rare decays of Z and Higgs bosons to J/ and a photon in proton-proton collisions at 13 TeV, European Physical Journal C: Particles and Fields, Vol: 79, ISSN: 1434-6044

A search is presented for decays of Z and Higgs bosons to a J/ meson and a photon, with the subsequent decay of the J/ to + −. The analysis uses data from proton-proton collisions with an integrated luminosity of 35.9fb−1 at √=13TeV collected with the CMS detector at the LHC. The observed limit on the Z→J/ decay branching fraction, assuming that the J/ meson is produced unpolarized, is 1.4×10−6 at 95% confidence level, which corresponds to a rate higher than expected in the standard model by a factor of 15. For extreme-polarization scenarios, the observed limit changes from −13.6 to +8.6% with respect to the unpolarized scenario. The observed upper limit on the branching fraction for H→J/ where the J/ meson is assumed to be transversely polarized is 7.6×10−4, a factor of 260 larger than the standard model prediction. The results for the Higgs boson are combined with previous data from proton-proton collisions at √=8TeV to produce an observed upper limit on the branching fraction for H→J/ that is a factor of 220 larger than the standard model value.

Journal article

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Bruyn I, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilin B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Starling E, Vander Velde C, Vanlaer P, Vannerom D, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, David P, Delaere C, Delcourt M, Francois B, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Piotrzkowski K, Saggio A, Marono MV, Wertz S, Zobec J, Alves FL, Alves GA, Brito L, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Calligaris L, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula SS, Romero Abad D, Aleksandrov A, Hadjiiska R, Iaydjiev P, Marinov A, Misheva M, Roet al., 2019, Search for the Higgs Boson decaying to two muons in proton-proton collisions at root s=13 TeV, Physical Review Letters, Vol: 122, ISSN: 0031-9007

A search for the Higgs boson decaying to two oppositely charged muons is presented using data recorded by the CMS experiment at the CERN LHC in 2016 at a center-of-mass energy √s=13  TeV, corresponding to an integrated luminosity of 35.9  fb−1. Data are found to be compatible with the predicted background. For a Higgs boson with a mass of 125.09 GeV, the 95% confidence level observed (background-only expected) upper limit on the production cross section times the branching fraction to a pair of muons is found to be 3.0 (2.5) times the standard model expectation. In combination with data recorded at center-of-mass energies √s=7 and 8 TeV, the background-only expected upper limit improves to 2.2 times the standard model value with a standard model expected significance of 1.0 standard deviation. The corresponding observed upper limit is 2.9 with an observed significance of 0.9 standard deviation. This corresponds to an observed upper limit on the standard model Higgs boson branching fraction to muons of 6.4×10−4 and to an observed signal strength of 1.0±1.0(stat)±0.1(syst).

Journal article

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilin B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Wang Q, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, David P, Delaere C, Delcourt M, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Piotrzkowski K, Saggio A, Marono MV, Wertz S, Zobec J, Alves FL, Alves GA, Correa Martins Junior M, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Calligaris L, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula S, Aleksandrov A, Hadjiiska R, Iaydjiev P, Marinov A, Misheva M, Rodozov M, Shopova M, Sultanov G, Dimitet al., 2019, Search for supersymmetry in events with a photon, a lepton, and missing transverse momentum in proton-proton collisions at root s=13 TeV, Publisher: SPRINGER

Working paper

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Fruehwirth R, Ghete VM, Hrubec J, Jeitler M, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Pieters M, Van De Klundert M, Janssen X, Lauwers J, Pieters M, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Bruyn I, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilin B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Wang Q, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Trocino D, Tytgat M, Verbeke W, Vermassen B, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, David P, Delaere C, Delcourt M, Francois B, Giammanco A, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Piotrzkowski K, Saggio A, Marono MV, Wertz S, Zobec J, Alves FL, Alves GA, Martins Junior MC, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, De Oliveira Martins C, Fonseca De Souza S, Malbouisson H, Matos Figueiredo D, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Prado Da Silva WL, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Calligaris L, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SF, Padula SS Ret al., 2019, Search for dark matter particles produced in association with a top quark pair at root s=13 TeV, Physical Review Letters, Vol: 122, ISSN: 0031-9007

A search is performed for dark matter particles produced in association with a top quark pair in proton-proton collisions at √s=13  TeV. The data correspond to an integrated luminosity of 35.9  fb−1 recorded by the CMS detector at the LHC. No significant excess over the standard model expectation is observed. The results are interpreted using simplified models of dark matter production via spin-0 mediators that couple to dark matter particles and to standard model quarks, providing constraints on the coupling strength between the mediator and the quarks. These are the most stringent collider limits to date for scalar mediators, and the most stringent for pseudoscalar mediators at low masses.

Journal article

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Eroe J, Del Valle AE, Flechl M, Friedl M, Fruehwirth R, Ghete VM, Grossmann J, Hrubec J, Jeitler M, Koenig A, Krammer N, Kraetschmer I, Liko D, Madlener T, Mikulec I, Pree E, Rad N, Rohringer H, Schieck J, Schoefbeck R, Spanring M, Spitzbart D, Taurok A, Waltenberger W, Wittmann J, Wulz C-E, Zarucki M, Chekhovsky V, Mossolov V, Gonzalez JS, De Wolf EA, Di Croce D, Janssen X, Lauwers J, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Abu Zeid S, Blekman F, D'Hondt J, De Bruyn I, De Clercq J, Deroover K, Flouris G, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Moreels L, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Beghin D, Bilin B, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Dorney B, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Kalsi AK, Lenzi T, Luetic J, Maerschalk T, Marinov A, Seva T, Starling E, Vander Velde C, Vanlaer P, Vannerom D, Yonamine R, Zenoni F, Cornelis T, Dobur D, Fagot A, Gul M, Khvastunov I, Poyraz D, Roskas C, Salva S, Trocino D, Tytgat M, Verbeke W, Vit M, Zaganidis N, Bakhshiansohi H, Bondu O, Brochet S, Bruno G, Caputo C, Caudron A, David P, De Visscher S, Delaere C, Delcourt M, Francois B, Giammanco A, Komm M, Krintiras G, Lemaitre V, Magitteri A, Mertens A, Musich M, Piotrzkowski K, Quertenmont L, Saggio A, Marono MV, Wertz S, Zobec J, Alda Junior WL, Alves FL, Alves GA, Brito L, Correia Silva G, Hensel C, Moraes A, Pol ME, Rebello Teles P, Belchior Batista Das Chagas E, Carvalho W, Chinellato J, Coelho E, Da Costa EM, Da Silveira GG, De Jesus Damiao D, Fonseca De Souza S, Huertas Guativa LM, Malbouisson H, Melo De Almeida M, Mora Herrera C, Mundim L, Nogima H, Sanchez Rosas LJ, Santoro A, Sznajder A, Thiel M, Tonelli Manganote EJ, Torres Da Silva De Araujo F, Vilela Pereira A, Ahuja S, Bernardes CA, Fernandez Perez Tomei TR, Gregores EM, Mercadante PG, Novaes SFet al., 2019, Search for Higgs boson pair production in the gamma gamma b(b)over-bar final state in pp collisions at root s=13 TeV, Physics Letters B, Vol: 788, Pages: 7-36, ISSN: 0370-2693

A search is presented for the production of a pair of Higgs bosons, where one decays into two photons and the other one into a bottom quark–antiquark pair. The analysis is performed using proton–proton collision data at recorded in 2016 by the CMS detector at the LHC, corresponding to an integrated luminosity of . The results are in agreement with standard model (SM) predictions. In a search for resonant production, upper limits are set on the cross section for new spin-0 or spin-2 particles. For the SM-like nonresonant production hypothesis, the data exclude a product of cross section and branching fraction larger than at 95% confidence level (CL), corresponding to about 24 times the SM prediction. Values of the effective Higgs boson self-coupling are constrained to be within the range at 95% CL, assuming all other Higgs boson couplings are at their SM value. The constraints on are the most restrictive to date.

Journal article

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