Browsing by Author "Kalakhety, H."
Now showing items 41-60 of 133
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Measurement of the polarization of w bosons with large transverse momenta in W+jets events at the LHC
Chatrchyan, S. A.; Khachatryan, Vardan; Sirunyan, A. M.; Baarmand, Marc M.; Dorney, B.; Guragain, Samir; Hohlmann, Marcus; Kalakhety, H.; Ralich, Robert M.; Vodopiyanov, Igor B. (2011-07-06)A first measurement of the polarization of W bosons with large transverse momenta in pp collisions is presented. The measurement is based on 36 pb 1 of data recorded at ffiffi s p ¼ 7 TeV by the CMS detector at the LHC. ... -
Measurement of the pp→ZZ production cross section and constraints on anomalous triple gauge couplings in four-lepton final states at s=8 TeV
Khachatryan, Vardan; Sirunyan, A. M.; Tumasyan, A. R.; Adam, Wolfgang; Bergauer, Thomas; Dragicevic, Marko; Baarmand, Marc M.; Hohlmann, Marcus; Kalakhety, H.; Yumiceva, Francisco X. (2015-01)A measurement of the inclusive ZZ production cross section and constraints on anomalous triple gauge couplings in proton-proton collisions at s=8 TeV are presented. The analysis is based on a data sample, corresponding to ... -
Measurement of the production cross section ratio σ(χb2(1P))/σ(χb1(1P)) in pp collisions at s=8TeV
Khachatryan, Vardan; Sirunyan, A. M.; Tumasyan, A. R.; Adam, Wolfgang; Bergauer, Thomas; Dragicevic, Markos; Baarmand, Marc M.; Hohlmann, Marcus; Kalakhety, H.; Yumiceva, Francisco X. (2015-04-09)A measurement of the production cross section ratio σ(χb2(1P))/σ(χb1(1P)) is presented. The χb1(1P) and χb2(1P) bottomonium states, promptly produced in pp collisions at s=8TeV, are detected by the CMS experiment at the ... -
Measurement of the production cross sections for a Z boson and one or more b jets in pp collisions at √s = 7 TeV
Baarmand, Marc M.; Dorney, B.; Hohlmann, Marcus; Kalakhety, H.; Yumiceva, Francisco X.; Chatrchyan, S. A.; Khachatryan, Vladimir A.; Sirunyan, A. M.; Tumasyan, A. R.; Adam, Wolfgang (2014-06-12)The production of a Z boson, decaying into two leptons and produced in association with one or more b jets, is studied using proton-proton collisions delivered by the LHC at a centre-of-mass energy of 7 TeV. The data were ... -
Measurement of the properties of a Higgs boson in the four-lepton final state
Chatrchyan, S. A.; Khachatryan, Vladimir A.; Sirunyan, A. M.; Tumasyan, A. R.; Adam, Wolfgang; Baarmand, Marc M.; Dorney, B.; Hohlmann, Marcus; Kalakhety, H.; Yumiceva, Francisco X. (2014-05-14)The properties of a Higgs boson candidate are measured in the H→ZZ→4 decay channel, with =e, μ, using data from pp collisions corresponding to an integrated luminosity of 5.1fb-1 at the center-of-mass energy of s=7TeV and ... -
Measurement of the pseudorapidity and centrality dependence of the transverse energy density in pb-pb collisions at √s <inf>NN</inf>=2.76TeV
Chatrchyan, S. A.; Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A. R.; Wolfgang, Adam; Baarmand, Marc M.; Dorney, B.; Hohlmann, Marcus; Kalakhety, H.; Vodopiyanov, Igor B. (2012-10-08)The transverse energy (ET) in Pb-Pb collisions at 2.76 TeV nucleon-nucleon center-of-mass energy ( ffiffiffiffiffiffiffiffi sNN p ) has been measured over a broad range of pseudorapidity ( ) and collision centrality by ... -
Measurement of the ratio of the production cross sections times branching fractions of Bc ±→ J/ψπ± and B± → J/ψK± and (Formula presented.) in pp collisions at (Formula presented.) TeV
Khachatryan, Vardan; Sirunyan, A. M.; Tumasyan, A. R.; Adam, Wolfgang; Dragicevic, Marko; Baarmand, Marc M.; Hohlmann, Marcus; Kalakhety, H.; Yumiceva, Francisco X. (2015-01)The ratio of the production cross sections times branching fractions (Formula presented.)(Formula presented.) is studied in proton-proton collisions at a center-of-mass energy of 7 TeV with the CMS detector at the LHC. The ... -
Measurement of the t-channel single top quark production cross section in pp collisions at √s=7TeV
Chatrchyan, S. A.; Khachatryan, Vardan; Sirunyan, A. M.; Baarmand, Marc M.; Dorney, B.; Guragain, Samir; Hohlmann, Marcus; Kalakhety, H.; Ralich, Robert M.; Vodopiyanov, Igor B. (2011-08-25)Electroweak production of the top quark is measured for the first time in pp collisions at ffiffi s p ¼ 7 TeV, using a data set collected with the CMS detector at the LHC and corresponding to an integrated luminosity of ... -
Measurement of the t-channel single-top-quark production cross section and of the |Vtb| CKM matrix element in pp collisions at √S = 8
Baarmand, Marc M.; Hohlmann, Marcus; Kalakhety, H.; Yumiceva, Francisco X.; Khachatryan, Vladimir A.; Sirunyan, A. M.; Tumasyan, A. R.; Adam, Wolfgang; Bergauer, Thomas; Dragicevic, Marko (2014-06-16)Measurements are presented of the t-channel single-top-quark production cross section in proton-proton collisions at s√ = 8 TeV. The results are based on a data sample corresponding to an integrated luminosity of 19.7 fb−1 ... -
Measurement of the top quark mass using charged particles in pp collisions at s =8 TeV
Khachatryan, V.; Sirunyan, A.M.; Baarmand, M.M.; Bhopatkar, Vallary; Colafranceschi, Stefano; Hohlmann, Marcus; Kalakhety, H.; Noonan, D.; Roy, Tuhin S.; Yumiceva, Francisco X. (2016-05-18)A novel technique for measuring the mass of the top quark that uses only the kinematic properties of its charged decay products is presented. Top quark pair events with final states with one or two charged leptons and ... -
Measurement of the top quark mass using proton-proton data at (s)=7 and 8 TeV MEASUREMENT of the TOP QUARK MASS USING ⋯ V. KHACHATRYAN et al.
Khachatryan, V.; Sirunyan, A.M.; Baarmand, M.M.; Bhopatkar, Vallary; Colafranceschi, Stefano; Hohlmann, Marcus; Kalakhety, H.; Noonan, D.; Roy, Tuhin S.; Yumiceva, Francisco X. (2016-04-07)A new set of measurements of the top quark mass are presented, based on the proton-proton data recorded by the CMS experiment at the LHC at s=8 TeV corresponding to a luminosity of 19.7 fb-1. The top quark mass is measured ... -
Measurement of the Top Quark Pair Production Cross Section in Proton-Proton Collisions at s =13 TeV
Khachatryan, Vardan; Sirunyan, A.M.; Baarmand, Marc M.; Bhopatkar, Vallary; Colafranceschi, Stefano; Hohlmann, Marcus; Kalakhety, H.; Noonan, Daniel; Roy, Tuhin S.; Yumiceva, Francisco X. (2016-02-05)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 of the triple-differential cross section for photon + jets production in proton-proton collisions at √ = 7 TeV
Baarmand, Marc M.; Hohlmann, Marcus; Dorney, B.; Yumiceva, Francisco X.; Kalakhety, H.; Chatrchyan, S. A.; Khachatryan, v; Sirunyan, A. M.; Tumasyan, A. R.; Adam, Wolfgang (2014-06-03)A measurement of the triple-differential cross section, d3 σ/ (dpT γdηγ dηjet), in photon + jets final states using a data sample from proton-proton collisions at √ = 7 TeV is presented. This sample corresponds to an ... -
Measurement of the Wγ and Zγ inclusive cross sections in pp collisions at s =7 TeV and limits on anomalous triple gauge boson couplings
Baarmand, Marc M.; Dorney, B.; Hohlmann, Marcus; Kalakhety, H.; Yumiceva, Francisco X.; Chatrchyan, S. A.; Khachatryan, Vladimir A.; Sirunyan, A. M.; Tumasyan, A. R.; Adam, Wolfgang (2014-05-13)Measurements of Wγ and Zγ production in proton-proton collisions at s=7TeV are used to extract limits on anomalous triple gauge couplings. The results are based on data recorded by the CMS experiment at the LHC that ... -
Measurements of t t ¯ spin correlations and top quark polarization using dilepton final states in pp collisions at s =8 TeV
Khachatryan, V.; Sirunyan, A.M.; Baarmand, M.M.; Bhopatkar, Vallary; Colafranceschi, Stefano; Hohlmann, Marcus; Kalakhety, H.; Noonan, D.; Roy, Tuhin S.; Yumiceva, Francisco X. (2016-03-09)Measurements of the top quark-antiquark (tt¯) spin correlations and the top quark polarization are presented for tt¯ pairs produced in pp collisions at s=8 TeV. The data correspond to an integrated luminosity of 19.5 fb-1 ... -
Measurements of t t ̄ spin correlations and top-quark polarization using dilepton final states in pp collisions at s =7TeV
Chatrchyan, S. A.; Khachatryan, Vladimir A.; Sirunyan, A. M.; Tumasyan, A. R.; Adam, Wolfgang; Baarmand, Marc M.; Dorney, B.; Hohlmann, Marcus; Kalakhety, H.; Yumiceva, Francisco X. (2014-05-05)Spin correlations and polarization in the top quark–antiquark system are measured using dilepton final states produced in pp collisions at the LHC at s√=7 TeV. The data correspond to an integrated luminosity of 5.0 fb−1 ... -
Measurements of the tt̄ charge asymmetry using the dilepton decay channel in pp collisions at s = 7 TeV
Baarmand, Marc M.; Dorney, B.; Hohlmann, Marcus; Kalakhety, H.; Yumiceva, Francisco X.; Chatrchyan, S. A.; Khachatryan, Vladimir A.; Sirunyan, A. M.; Tumasyan, A. R.; Adam, Wolfgang (2014-04-30)The tt¯ charge asymmetry in proton-proton collisions at s√ = 7 TeV is measured using the dilepton decay channel (ee, eμ, or μμ). The data correspond to a total integrated luminosity of 5.0 fb−1, collected by the CMS ... -
Observation of a new Ξ <inf>b</inf> baryon
Chatrchyan, S. A.; Khachatryan, Vardan; Sirunyan, A. M.; Tumasyan, A. R.; Adam, Adam; Baarmand, Marc M.; Dorney, B.; Hohlmann, Marcus; Kalakhety, H.; Vodopiyanov, Igor B. (2012-06-21)The observation of a new b baryon via its strong decay into b þ (plus charge conjugates) is reported. The measurement uses a data sample of pp collisions at ffiffi s p ¼ 7 TeV collected by the CMS experiment at the ... -
Observation of long-range, near-side angular correlations in proton-proton collisions at the LHC
Baarmand, Marc M.; Dorney, B.; Guragain, Samir; Hohlmann, Marcus; Kalakhety, H.; Ralich, Robert M.; Vodopiyanov, Igor; Khachatryan, Vardan; Sirunyan, A. M.; Tumasyan, A. R. (2010-09)esults on two-particle angular correlations for charged particles emitted in proton-proton collisions at center-of-mass energies of 0.9, 2.36, and 7TeV are presented, using data collected with the CMS detector over a broad ... -
Observation of sequential Υ suppression in PbPb collisions
Sirunyan, A.M.; Chatrchyan, S. A.; Khachatryan, Vardan; Tumasyan, A. R.; Wolfgang, Adam; Baarmand, Marc M.; Dorney, B.; Hohlmann, Marcus; Kalakhety, H.; Vodopiyanov, Igor B. (2012-11-26)The suppression of the individual ðnSÞ states in PbPb collisions with respect to their yields in pp data has been measured. The PbPb and pp data sets used in the analysis correspond to integrated luminosities of 150 b ...