Publications
391 results found
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Search for new phenomena in monophoton final states in proton-proton collisions at root s=8 TeV, PHYSICS LETTERS B, Vol: 755, Pages: 102-124, ISSN: 0370-2693
Results are presented from a search for new physics in final states containing a photon and missing transverse momentum. The data correspond to an integrated luminosity of 19.6 fb−1 collected in proton–proton collisions at View the MathML source with the CMS experiment at the LHC. No deviation from the standard model predictions is observed for these final states. New, improved limits are set on dark matter production and on parameters of models with large extra dimensions. In particular, the first limits from the LHC on branon production are found and significantly extend previous limits from LEP and the Tevatron. An upper limit of 14.0 fb on the cross section is set at the 95% confidence level for events with a monophoton final state with photon transverse momentum greater than 145 GeV and missing transverse momentum greater than 140 GeV.
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Searches for a heavy scalar boson H decaying to a pair of 125 GeV Higgs bosons hh or for a heavy pseudoscalar boson A decaying to Zh, in the final states with h → ττ, Physics Letters B, Vol: 755, Pages: 217-244, ISSN: 0370-2693
A search for a heavy scalar boson H decaying into a pair of lighter standard-model-like 125 GeV Higgs bosons hh and a search for a heavy pseudoscalar boson A decaying into a Z and an h boson are presented. The searches are performed on a data set corresponding to an integrated luminosity of 19.7 fb−1 of pp collision data at a centre-of-mass energy of 8 TeV, collected by CMS in 2012. A final state consisting of two τ leptons and two b jets is used to search for the H→hh decay. A final state consisting of two τ leptons from the h boson decay, and two additional leptons from the Z boson decay, is used to search for the decay A→Zh. The results are interpreted in the context of two-Higgs-doublet models. No excess is found above the standard model expectation and upper limits are set on the heavy boson production cross sections in the mass ranges 260<mH<350 GeV and 220<mA<350 GeV.
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Measurement of the top quark mass using proton-proton data at √(s)=7 and 8 TeV, Physical Review D, Vol: 93, ISSN: 1550-7998
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Search for anomalous single top quark production in association with a photon in pp collisions at √s=8 TeV, Journal of High Energy Physics, Vol: 2016, ISSN: 1126-6708
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Erratum to: Comparison of the Z/γ* + jets to γ + jets cross sections in pp collisions at s√=8, Journal of High Energy Physics, Vol: 2016, ISSN: 1126-6708
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Measurement of differential and integrated fiducial cross sections for Higgs boson production in the four-lepton decay channel in pp collisions at √s=7 and 8 TeV, Journal of High Energy Physics, Vol: 2016, ISSN: 1126-6708
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Inclusive and differential measurements of the t(t)over-bar charge asymmetry in pp collisions at root s=8 TeV, Physics Letters B, Vol: 757, Pages: 154-179, ISSN: 0370-2693
The View the MathML source charge asymmetry is measured in proton–proton collisions at a centre-of-mass energy of 8 TeV. The data, collected with the CMS experiment at the LHC, correspond to an integrated luminosity of 19.7 fb−1. Selected events contain an electron or a muon and four or more jets, where at least one jet is identified as originating from b-quark hadronization. The inclusive charge asymmetry is found to be 0.0010±0.0068 (stat)±0.0037 (syst). In addition, differential charge asymmetries as a function of rapidity, transverse momentum, and invariant mass of the View the MathML source system are studied. For the first time at the LHC, the measurements are also performed in a reduced fiducial phase space of top quark pair production, with an integrated result of −0.0035±0.0072 (stat)±0.0031 (syst). All measurements are consistent within two standard deviations with zero asymmetry as well as with the predictions of the standard model.
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Measurement of the CP-violating weak phase phi(s) and the decay width difference Delta Gamma(s) using the B-s(0) -> J/psi phi (1020) decay channel in pp collisions at root s=8 TeV, Physics Letters B, Vol: 757, Pages: 97-120, ISSN: 0370-2693
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Search for dark matter and unparticles produced in association with a Z boson in proton-proton collisions at √s=8 TeV, Physical Review D, Vol: 93, ISSN: 1550-7998
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Search for supersymmetry in events with a photon, a lepton, and missing transverse momentum in pp collisions at root s=8 TeV, Physics Letters B, Vol: 757, Pages: 6-31, ISSN: 0370-2693
A search for supersymmetry involving events with at least one photon, one electron or muon, and large missing transverse momentum has been performed by the CMS experiment. The data sample corresponds to an integrated luminosity of 19.7 fb−1 of pp collisions at View the MathML source, produced at the CERN LHC. No excess of events is observed beyond expectations from standard model processes. The result of the search is interpreted in the context of a general model of gauge-mediated supersymmetry breaking, where the charged and neutral winos are the next-to-lightest supersymmetric particles. Within this model, winos with a mass up to 360 GeV are excluded at the 95% confidence level. Two simplified models inspired by gauge-mediated supersymmetry breaking are also examined, and used to derive upper limits on the production cross sections of specific supersymmetric processes.
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Event generator tunes obtained from underlying event and multiparton scattering measurements, European Physical Journal C, Vol: 76, ISSN: 1434-6052
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Search for excited leptons in proton-proton collisions at √s=8 TeV, Journal of High Energy Physics, Vol: 2016, ISSN: 1126-6708
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Measurements of tt¯ spin correlations and top quark polarization using dilepton final states in pp collisions at √s=8 TeV, Physical Review D, Vol: 93, ISSN: 1550-7998
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Measurement of the tt¯ production cross section in the all-jets final state in pp collisions at √s=8 TeV, European Physical Journal C, Vol: 76, ISSN: 1434-6052
Ghergherehchi CL, Bittner GD, Hastings RL, et al., 2016, Effects of Extracellular Calcium and Surgical Techniques on Restoration of Axonal Continuity by Polyethylene Glycol Fusion Following Complete Cut or Crush Severance of Rat Sciatic Nerves, JOURNAL OF NEUROSCIENCE RESEARCH, Vol: 94, Pages: 231-245, ISSN: 0360-4012
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- Citations: 25
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Measurement of the ratio B(B-s(0) -> J/psi f(0)(980))/B(B-s(0) -> J/psi phi(1020)) in pp collisions at root s=7 TeV, Physics Letters B, Vol: 756, Pages: 84-102, ISSN: 0370-2693
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Search for pair production of first and second generation leptoquarks in proton-proton collisions at √s=8 TeV, Physical Review D, Vol: 93, ISSN: 1550-7998
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Search for single production of scalar leptoquarks in proton-proton collisions at √s=8 TeV, Physical Review D, Vol: 93, ISSN: 1550-7998
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Correlations between jets and charged particles in PbPb and pp collisions at root s(NN)=2.76 TeV, Journal of High Energy Physics, Vol: 2016, ISSN: 1126-6708
The quark-gluon plasma is studied via medium-induced changes to correlations between jets and charged particles in PbPb collisions compared to pp reference data. This analysis uses data sets from PbPb and pp collisions with integrated luminosities of 166 μb−1 and 5.3 pb−1, respectively, collected at sNN−−−√=2.76sNN=2.76 TeV. The angular distributions of charged particles are studied as a function of relative pseudorapidity (Δη) and relative azimuthal angle (Δϕ) with respect to reconstructed jet directions. Charged particles are correlated with all jets with transverse momentum (p T) above 120 GeV, and with the leading and subleading jets (the highest and second-highest in p T, respectively) in a selection of back-to-back dijet events. Modifications in PbPb data relative to pp reference data are characterized as a function of PbPb collision centrality and charged particle p T. A centrality-dependent excess of low-p T particles is present for all jets studied, and is most pronounced in the most central events. This excess of low-p T particles follows a Gaussian-like distribution around the jet axis, and extends to large relative angles of Δη ≈ 1 and Δϕ ≈ 1.
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Search for a massive resonance decaying into a Higgs boson and a W or Z boson in hadronic final states in proton-proton collisions at √s=8 TeV, Journal of High Energy Physics, Vol: 2016, ISSN: 1126-6708
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Measurement of the charge asymmetry in top quark pair production in pp collisions at √s=8 TeV using a template method, Physical Review D, Vol: 93, ISSN: 1550-7998
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Search for W′ → tb in proton-proton collisions at √s=8 TeV, Journal of High Energy Physics, Vol: 2016, ISSN: 1126-6708
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Search for Narrow Resonances Decaying to Dijets in Proton-Proton Collisions at √s=13 TeV, Physical Review Letters, Vol: 116, ISSN: 1079-7114
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Measurement of the Top Quark Pair Production Cross Section in Proton-Proton Collisions at √s=13 TeV, Physical Review Letters, Vol: 116, ISSN: 1079-7114
The top quark pair production cross section is measured for the first time in proton-proton collisions at s√=13 TeV by the CMS experiment at the CERN LHC, using data corresponding to an integrated luminosity of 43 pb−1. The measurement is performed by analyzing events with at least one electron and one muon of opposite charge, and at least two jets. The measured cross section is 746±58(stat)±53(syst)±36(lumi) pb, in agreement with the expectation from the standard model.
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Search for W ' decaying to tau lepton and neutrino in proton-proton collisions at root s=8 TeV, Physics Letters B, Vol: 755, Pages: 196-216, ISSN: 0370-2693
The first search for a heavy charged vector boson in the final state with a tau lepton and a neutrino is reported, using 19.7 fb−1 of LHC data at View the MathML source. A signal would appear as an excess of events with high transverse mass, where the standard model background is low. No excess is observed. Limits are set on a model in which the W′ decays preferentially to fermions of the third generation. These results substantially extend previous constraints on this model. Masses below 2.0 to 2.7 TeV are excluded, depending on the model parameters. In addition, the existence of a W′ boson with universal fermion couplings is excluded at 95% confidence level, for W′ masses below 2.7 TeV. For further reinterpretation a model-independent limit on potential signals for various transverse mass thresholds is also presented.
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Reconstruction and identification of tau lepton decays to hadrons and nu(tau) at CMS, Journal of Instrumentation, Vol: 11, ISSN: 1748-0221
This paper describes the algorithms used by the CMS experiment to reconstruct and identify τ → hadrons + ντ decays during Run 1 of the LHC. The performance of the algorithms is studied in proton-proton collisions recorded at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 fb−1. The algorithms achieve an identification efficiency of 50–60%, with misidentification rates for quark and gluon jets, electrons, and muons between per mille and per cent levels.
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Search for the production of an excited bottom quark decaying to tW in proton-proton collisions at √s=8 TeV, Journal of High Energy Physics, Vol: 2016, ISSN: 1126-6708
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Study of B Meson Production in p+Pb Collisions at √sNN=5.02 TeV Using Exclusive Hadronic Decays, Physical Review Letters, Vol: 116, ISSN: 1079-7114
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Search for vectorlike charge 2/3 T quarks in proton-proton collisions at √(s)=8 TeV, Physical Review D, Vol: 93, ISSN: 1550-7998
Khachatryan V, Sirunyan AM, Tumasyan A, et al., 2016, Observation of top quark pairs produced in association with a vector boson in pp collisions at √s=8 TeV, Journal of High Energy Physics, Vol: 2016, ISSN: 1126-6708
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