Browsing Faculty of Engineering by Author "Chatrchyan, S."
Now showing items 41-60 of 203
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Measurement of the B-s(0) ->mu(+)mu(-) branching fraction and search for B-0 -> mu(+)mu(-) with the CMS experiment
Chatrchyan, S.; Işıldak, Bora (American Physical Society, 2013-09-06)Results are presented from a search for the rare decays B-s(0) -> mu(+) mu(-) and B-0 -> mu(+) mu(-) in pp collisions at root s = 7 and 8 TeV, with data samples corresponding to integrated luminosities of 5 and 20 fb(-1), ... -
Measurement of the cross section and angular correlations for associated production of a Z boson with b hadrons in pp collisions at s√ = 7 TeV
Chatrchyan, S.; Işıldak, Bora (Elsevier, 2013-12)A study of proton-proton collisions in which two b hadrons are produced in association with a Z boson is reported. The collisions were recorded at a centre-of-mass energy of 7 TeVwith the CMS detector at the LHC, for an ... -
Measurement of the differential and double-differential Drell-Yan cross sections in proton-proton collisions at s√ = 7 TeV
Chatrchyan, S.; Işıldak, Bora (Springer Science+Business Media, 2013-12)Measurements of the differential and double-differential Drell-Yan cross sections are presented using an integrated luminosity of 4.5 (4.8) fb−1 in the dimuon (dielectron) channel of proton-proton collision data recorded ... -
Measurement of the electron charge asymmetry in inclusive w production in pp collisions at root s=7 TeV
Chatrchyan, S.; Işıldak, Bora (American Physical Society, 2012-09-14)A measurement of the electron charge asymmetry in inclusive pp -> W + X -> ev + X production at root s = 7 TeV is presented based on data recorded by the CMS detector at the LHC and corresponding to an integrated luminosity ... -
Measurement of the hadronic activity in events with a Z and two jets and extraction of the cross section for the electroweak production of a Z with two jets in pp collisions at s√=7 TeV
Chatrchyan, S.; Işıldak, Bora (Springer International Publishing, 2013-10)The first measurement of the electroweak production cross section of a Z boson with two jets (Zjj) in pp collisions at s√=7s=7 TeV is presented, based on a data sample recorded by the CMS experiment at the LHC with an ... -
Measurement of the inelastic proton-proton cross section at root s=7 TeV
Chatrchyan, S.; Işıldak, Bora (Elsevier, 2013-05-13)A measurement is presented of the inelastic proton-proton cross section at a centre-of-mass energy of root s = 7 TeV. Using the CMS detector at the LHC, the inelastic cross section is measured through two independent methods ... -
Measurement of the Lambda(0)(b) lifetime in pp collisions at root s=7 TeV
Chatrchyan, S.; Işıldak, Bora (Springer Science+Business Media, 2013-07)A measurement of the Lambda(0)(b) lifetime using the decay Lambda(0)(b) -> J/psi Lambda in protonproton collisions at root s = 7TeV is presented. The data set, corresponding to an integrated luminosity of about 5 fb(-1), ... -
Measurement of the mass difference between top quark and antiquark in pp collisions at s=8 TeV
Chatrchyan, S.; Işıldak, Bora (Elsevier, 2017-07-10)The invariance of the standard model (SM) under the CPT transformation predicts equality of particle and antiparticle masses. This prediction is tested by measuring the mass difference between the top quark and antiquark ... -
Measurement of the muon charge asymmetry in inclusive pp -> W plus X production at root s=7 TeV and an improved determination of light parton distribution functions
Chatrchyan, S.; Işıldak, Bora (American Physical Society, 2014-08-01)Measurements of the muon charge asymmetry in inclusive pp -> W + X production at root s = 7 TeV are presented. The data sample corresponds to an integrated luminosity of 4.7 fb(-1) recorded with the CMS detector at the ... -
Measurement of the production cross section for a W boson and two b jets in pp collisions at root s=7 TeV
Chatrchyan, S.; Işıldak, Bora (Elsevier, 2014-07-30)The production cross section for a Wboson and two b jets is measured using proton-proton collisions at v root s = 7 TeV in a data sample collected with the CMS experiment at the LHC corresponding to an integrated luminosity ... -
Measurement of the production cross section for Z gamma -> nu(nu)over-bar gamma in pp collisions at root s=7 TeV and limits on ZZ gamma and Z gamma gamma triple gauge boson couplings
Chatrchyan, S.; Işıldak, Bora (Springer Science+Business Media, 2013-10)A measurement of the Zγ→νν¯γ cross section in pp collisions at s√=7 TeV is presented, using data corresponding to an integrated luminosity of 5.0 fb−1 collected with the CMS detector. This measurement is based on the ... -
Measurement of the production cross sections for a Z boson and one or more b jets in pp collisions at root s=7 TeV
Chatrchyan, S.; Işıldak, Bora (Springer Science+Business Media, 2014-06)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 prompt J/ψ and ψ(2S) polarizations in pp collisions at =7 TeV
Chatrchyan, S.; Işıldak, Bora (Elsevier, 2013-12-18)The polarizations of prompt J/ψ and ψ(2S) mesons are measured in proton–proton collisions at View the MathML source, using a dimuon data sample collected by the CMS experiment at the LHC, corresponding to an integrated ... -
Measurement of the properties of a Higgs boson in the four-lepton final state
Chatrchyan, S.; Işıldak, Bora (American Physical Society, 2014-05-01)The properties of a Higgs boson candidate are measured in the H -> ZZ -> 4l decay channel, with l = e, mu, using data from pp collisions corresponding to an integrated luminosity of 5.1 fb(-1) at the center-of-mass energy ... -
Measurement of the pseudorapidity and centrality dependence of the transverse energy density in Pb-Pb collisions at root s(NN)=2.76 TeV
Chatrchyan, S.; Işıldak, Bora (American Physical Society, 2012-10-12)The transverse energy (E-T) in Pb-Pb collisions at 2.76 TeV nucleon-nucleon center-of-mass energy (root s(NN)) has been measured over a broad range of pseudorapidity (eta) and collision centrality by using the CMS detector ... -
Measurement of the ratio B(t -> Wb)/B(t -> Wq) in pp collisions at root s=8 TeV
Chatrchyan, S.; Işıldak, Bora (Elsevier, 2014-09-07)The ratio of the top-quark branching fractions R = B(t --> Wb)/B(t --> Wq), where the denominator includes the sum over all down-type quarks (q = b, s, d), is measured in the t (t) over bar dilepton final state with ... -
Measurement of the ratio of inclusive jet cross sections using the anti-k(T) algorithm with radius parameters R=0.5 and 0.7 in pp collisions at root s=7 TeV
Chatrchyan, S.; Işıldak, Bora (American Physical Society, 2014-10-01)Measurements of the inclusive jet cross section with the anti-kT clustering algorithm are presented for two radius parameters, R=0.5 and 0.7. They are based on data from LHC proton-proton collisions at s√=7 TeV corresponding ... -
Measurement of the ratio of the inclusive 3-jet cross section to the inclusive 2-jet cross section in pp collisions at root s=7 TeV and first determination of the strong coupling constant in the TeV range
Chatrchyan, S.; Işıldak, Bora (Springer Science+Business Media, 2013-10)A measurement is presented of the ratio of the inclusive 3-jet cross section to the inclusive 2-jet cross section as a function of the average transverse momentum, < p(T1,2)>, of the two leading jets in the event. The data ... -
Measurement of the ratio of the production cross sections times branching fractions of B c ± → J/ψπ ± and B± → J/ψK ± and B(B±c→J/ψπ±π±π∓)/B(B±c→J/ψπ±)B(Bc±→J/ψπ±π±π∓)/B(Bc±→J/ψπ±) in pp collisions at s√=7s=7 TeV
Chatrchyan, S.; Işıldak, Bora (Springer Science+Business Media, 2015-01)The ratio of the production cross sections times branching fractions (σ(B±c)B(B±c→J/ψπ±))/(σ(B±)B(B±→J/ψK±))(σ(Bc±)B(Bc±→J/ψπ±))/(σ(B±)B(B±→J/ψK±)) is studied in proton-proton collisions at a center-of-mass energy of 7 ... -
Measurement of the single-top-quark t-channel cross section in pp collisions at root s=7 TeV
Chatrchyan, S.; Işıldak, Bora (Springer Science+Business Media, 2012-12)A measurement of the single-top-quark t-channel production cross section in pp collisions at root s = 7TeV with the CMS detector at the LHC is presented. Two different and complementary approaches have been followed. The ...
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