Browsing Faculty of Engineering by Author "Chatrchyan, S."
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Search for W ' -> tb decays in the lepton plus jets final state in pp collisions at root s=8 TeV
Chatrchyan, S.; Işıldak, Bora (Springer Science+Business Media, 2014-05)Results are presented from a search for the production of a heavy gauge boson W' decaying into a top and a bottom quark, using a data set collected by the CMS experiment at root s = 8 TeV and corresponding to an integrated ... -
Search for WW gamma and WZ gamma production and constraints on anomalous quartic gauge couplings in pp collisions at root s=8 TeV
Chatrchyan, S.; Işıldak, Bora (American Physical Society, 2014-08-01)A search for WV gamma triple vector boson production is presented based on events containing a W boson decaying to a muon or an electron and a neutrino, a second V (W or Z) boson, and a photon. The data correspond to an ... -
Search for Z ' resonances decaying to t(t)over-bar in dilepton plus jets final states in pp collisions at root s=7 TeV
Chatrchyan, S.; Işıldak, Bora (American Physical Society, 2013-04-01)A search for resonances decaying to top quark-antiquark pairs is performed using a dilepton + jets data sample recorded by the CMS experiment at the LHC in pp collisions at root s = 7 TeV corresponding to an integrated ... -
Search in leptonic channels for heavy resonances decaying to long-lived neutral particles
Chatrchyan, S.; Işıldak, Bora (Springer Science+Business Media, 2013-02)A search is performed for heavy resonances decaying to two long-lived massive neutral particles, each decaying to leptons. The experimental signature is a distinctive topology consisting of a pair of oppositely charged ... -
Searches for Higgs bosons in pp collisions at root s=7 and 8 TeV in the context of four-generation and fermiophobic models
Chatrchyan, S.; Işıldak, Bora (Elsevier, 2013-08-09)Searches are reported for Higgs bosons in the context of either the standard model extended to include a fourth generation of fermions (SM4) with masses of up to 600 GeV or fermiophobic models. For the former, results from ... -
Searches for light- and heavy-flavour three-jet resonances in pp collisions at 8 TeV
Chatrchyan, S.; Işıldak, Bora (Elsevier, 2014-03-07)A search for three-jet hadronic resonance production in pp collisions at a centre-of-mass energy of 8 TeV has been conducted by the CMS Collaboration at the LHC with a data sample corresponding to an integrated luminosity ... -
Searches for new physics using the t(t)over-bar invariant mass distribution in pp collisions at root s=8 TeV
Chatrchyan, S.; Işıldak, Bora (American Physical Society, 2013-11-22)Searches for anomalous top quark-antiquark production are presented, based on pp collisions at root s = 8 TeV. The data, corresponding to an integrated luminosity of 19.7 fb(-1), were collected with the CMS detector at the ... -
Searches for supersymmetry using the MT2 variable in hadronic events produced in pp collisions at 8 TeV
Chatrchyan, S.; Işıldak, Bora (Springer Science+Business Media, 2015-05)Searches for supersymmetry (SUSY) are performed using a sample of hadronic events produced in 8 TeV pp collisions at the CERN LHC. The searches are based on the M T2 variable, which is a measure of the transverse momentum ... -
Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at sNN−−−√ =2.76 TeV
Chatrchyan, S.; Işıldak, Bora (Springer Science+Business Media, 2014-02)Azimuthal dihadron correlations of charged particles have been measured in PbPb collisions at sNN−−−√ = 2.76TeV by the CMS collaboration, using data from the 2011 LHC heavy-ion run. The data set includes a sample of ... -
Studies of dijet transverse momentum balance and pseudorapidity distributions in pPb collisions at root s(NN)=5.02 TeV
Chatrchyan, S.; Işıldak, Bora (Springer Science+Business Media, 2014-07)Dijet production has been measured in collisions at a nucleon-nucleon centre-of-mass energy of 5.02. A data sample corresponding to an integrated luminosity of 35 was collected using the Compact Muon Solenoid detector at ... -
Studies of dijet transverse momentum balance and pseudorapidity√snn=5.02tev
Chatrchyan, S.; Işıldak, Bora (Springer Nature, 2014)Dijet production has been measured in pPbpPb collisions at a nucleon–nucleon centre-of-mass energy of 5.02 TeVTeV . A data sample corresponding to an integrated luminosity of 35 nb−1nb−1 was collected using the Compact ... -
Studies of jet mass in dijet and W/Z plus jet events
Chatrchyan, S.; Işıldak, Bora (Springer Science+Business Media, 2013-05)Invariant mass spectra for jets reconstructed using the anti-k(T) and Cambridge-Aachen algorithms are studied for different jet "grooming" techniques in data corresponding to an integrated luminosity of 5 fb(-1), recorded ... -
Studies of jet quenching using isolated-photon plus jet correlations in PbPb and pp collisions at root s(NN)=2.76 TeV
Chatrchyan, S.; Işıldak, Bora (Elsevier, 2013-01-08)Results from the first study of isolated-photon + jet correlations in relativistic heavy ion collisions are reported. The analysis uses data from PbPb collisions at a centre-of-mass energy of 2.76 TeV per nucleon pair ... -
Study of double parton scattering using W+2-jet events in proton-proton collisions at root s=7 TeV
Chatrchyan, S.; Işıldak, Bora (Elsevier, 2014-03)Double parton scattering is investigated in proton-proton collisions at = 7 TeV where the final state includes a W boson, which decays into a muon and a neutrino, and two jets. The data sample corresponds to an integrated ... -
Study of exclusive two-photon production of W+W- in pp collisions at root s=7 TeV and constraints on anomalous quartic gauge couplings
Chatrchyan, S.; Işıldak, Bora (Springer Science+Business Media, 2013-07)A search for exclusive or quasi-exclusive W+W- production by photon-photon interactions, pp -> p(*)W(+)W(-)p(*), at \/s = 7 TeV is reported using data collected by the CMS detector with an integrated luminosity of 5.05 ... -
Study of the dijet mass spectrum in pp -> W + jets events at root s=7 TeV
Chatrchyan, S.; Işıldak, Bora (American Physical Society, 2012-12-21)We report an investigation of the invariant mass spectrum of the two jets with highest transverse momentum in pp -> W + 2-jet and W + 3-jet events to look for resonant enhancement. The data sample corresponds to an integrated ... -
Study of the inclusive production of charged pions, kaons, and protons in pp collisions at root s=0.9, 2.76, and 7 TeV
Chatrchyan, S.; Işıldak, Bora (Springer Science+Business Media, 2012-10)Spectra of identified charged hadrons are measured in pp collisions at the LHC for root s = 0.9, 2.76, and 7 TeV. Charged pions, kaons, and protons in the transverse-momentum range p(T) approximate to 0.1-1.7 GeV/c and for ... -
Study of the mass and spin-parity of the Higgs boson candidate via its decays to Z boson pairs
Chatrchyan, S.; Işıldak, Bora (American Physical Society, 2013)A study is presented of the mass and spin-parity of the new boson recently observed at the LHC at a mass near 125 GeV. An integrated luminosity of 17: 3 fb(-1), collected by the CMS experiment in proton-proton collisions ... -
Study of the production of charged pions, kaons, and protons in pPb collisions at root SNN=5.02 TeV
Chatrchyan, S.; Işıldak, Bora (Springer Science+Business Media, 2014-06)Spectra of identified charged hadrons are measured in pPb collisions with the CMS detector at the LHC at . Charged pions, kaons, and protons in the transverse-momentum range -1.7 and laboratory rapidity are identified via ... -
Study of the underlying event at forward rapidity in pp collisions at root s=0.9, 2.76, and 7 TeV
Chatrchyan, S.; Işıldak, Bora (Springer Science+Business Media, 2013-04)The underlying event activity in proton-proton collisions at forward pseudorapidity (-6.6 < eta < -5.2) is studied with the CMS detector at the LHC, using a novel observable: the ratio of the forward energy density, ...
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