Browsing Faculty of Engineering by Author "Chatrchyan, S."
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Measurement of WZ and ZZ production in pp collisions at in final states with b-tagged jets
Chatrchyan, S.; Işıldak, Bora (Springer Science+Business Media, 2014-08)Measurements are reported of the WZ and ZZ production cross sections in proton-proton collisions at in final states where one Z boson decays to b-tagged jets. The other gauge boson, either W or Z, is detected through its ... -
Measurements of differential jet cross sections in proton-proton collisions at root s=7 TeV with the CMS detector
Chatrchyan, S.; Işıldak, Bora (American Physical Society, 2013-06-01)Measurements of inclusive jet and dijet production cross sections are presented. Data from LHC proton-proton collisions at root s = 7 TeV, corresponding to 5.0 fb(-1) of integrated luminosity, have been collected with the ... -
Measurements of t(t)over-bar spin correlations and top-quark polarization using dilepton final states in pp collisions at root s=7 TeV
Chatrchyan, S.; Işıldak, Bora (American Physical Society, 2014-05-09)Spin correlations and polarization in the top quark-antiquark system are measured using dilepton final states produced in pp collisions at the LHC at root s = 7 TeV. The data correspond to an integrated luminosity of 5.0 ... -
Measurements of the t(t)Overbar charge asymmetry using the dilepton decay channel in pp collisions at root s=7 TeV
Chatrchyan, S.; Işıldak, Bora (Springer Science+Business Media, 2014-04)The t(t)Overbar charge asymmetry in proton-proton collisions root s = 7TeV is measured using the dilepton decay channel (ee, e mu, or mu mu). The data correspond to a total integrated luminosity of 5.0 fb(-1), collected ... -
Modification of jet shapes in PbPb collisions at root s(NN)=2.76 TeV
Chatrchyan, S.; Işıldak, Bora (Elsevier, 2014-03-07)The first measurement of jet shapes, defined as the fractional transverse momentum radial distribution, for inclusive jets produced in heavy-ion collisions is presented. Data samples of PbPb and pp collisions, corresponding ... -
Multiplicity and transverse momentum dependence of two- and four-particle correlations in pPb and PbPb collisions
Chatrchyan, S.; Işıldak, Bora (Elsevier, 2013-07-23)Measurements of two- and four-particle angular correlations for charged particles emitted in pPb collisions are presented over a wide range in pseudorapidity and full azimuth. The data, corresponding to an integrated ... -
A new boson with a mass of 125 GeV observed with the CMS experiment at the large hadron collider
Chatrchyan, S.; Işıldak, Bora (American Association for the Advancement of Science, 2012-12-21)The Higgs boson was postulated nearly five decades ago within the framework of the standard model of particle physics and has been the subject of numerous searches at accelerators around the world. Its discovery would ... -
Observation of a diffractive contribution to dijet production in proton-proton collisions at root s = 7 TeV
Chatrchyan, S.; Işıldak, Bora (American Physical Society, 2013-01-08)The cross section for dijet production in proton-proton collisions at root s = 7 TeV is presented as a function of (xi) over tilde, a variable that approximates the fractional momentum loss of the scattered proton in ... -
Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
Chatrchyan, S.; Işıldak, Bora (Elsevier, 2012-09-17)Results are presented from searches for the standard model Higgs boson in proton-proton collisions at root s = 7 and 8 TeV in the Compact Muon Solenoid experiment at the LHC, using data samples corresponding to integrated ... -
Observation of a new boson with mass near 125 GeV in pp collisions at root s=7 and 8 TeV
Chatrchyan, S.; Işıldak, Bora (Springer Science+Business Media, 2013-06)A detailed description is reported of the analysis used by the CMS Collaboration in the search for the standard model Higgs boson in pp collisions at the LHC, which led to the observation of a new boson. The data sample ... -
Observation of a new Xi(b) baryon
Chatrchyan, S.; Işıldak, Bora (American Physical Society, 2012-06-22)The observation of a new b baryon via its strong decay into Xi(-)(b)pi(+) (plus charge conjugates) is reported. The measurement uses a data sample of pp collisions at root s = 7 TeV collected by the CMS experiment at the ... -
Observation of a peaking structure in the J/psi phi mass spectrum from B-+/- -> J/psi phi K-+/- decays
Chatrchyan, S.; Işıldak, Bora (Elsevier, 2014-06-27)A peaking structure in the J/psi phi mass spectrum near threshold is observed in B-+/- -> J/psi phi K-+/- decays, produced in pp collisions at root s = 7 TeV collected with the CMS detector at the LHC. The data sample, ... -
Observation of long-range, near-side angular correlations in pPb collisions at the LHC
Chatrchyan, S.; Işıldak, Bora (Elsevier, 2013-01-08)Results on two-particle angular correlations for charged particles emitted in pPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV are presented. The analysis uses two million collisions collected with the ... -
Observation of sequential upsilon suppression in PbPb collisions
Chatrchyan, S.; Işıldak, Bora (American Physical Society, 2012-11-30)The suppression of the individual gamma (nS) 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 ... -
Observation of the associated production of a single top quark - and a W boson in pp collisions at root s=8 TeV
Chatrchyan, S.; Işıldak, Bora (American Physical Society, 2014-06-13)The first observation of the associated production of a single top quark and a W boson is presented. The analysis is based on a data set corresponding to an integrated luminosity of 12.2 fb(-1) of proton-proton collisions ... -
Observation of Z decays to four leptons with the CMS detector at the LHC
Chatrchyan, S.; Işıldak, Bora (Springer Science+Business Media, 2012-12)The first observation of the Z boson decaying to four leptons in proton-proton collisions is presented. The analyzed data set corresponds to an integrated luminosity of 5.02 fb(-1) at root s = 7 TeV collected by the CMS ... -
The performance of the CMS muon detector in proton-proton collisions at √ s = 7 TeV at the LHC
Chatrchyan, S.; Işıldak, Bora (IOP Publishing, 2013-11)The performance of all subsystems of the CMS muon detector has been studied by using a sample of proton-proton collision data at √s = 7 TeV collected at the LHC in 2010 that corresponds to an integrated luminosity of ... -
Probing color coherence effects in pp collisions at root s=7 TeV
Chatrchyan, S.; Işıldak, Bora (Springer Science+Business Media, 2014-06)A study of color coherence effects in pp collisions at a center-of-mass energy of 7 is presented. The data used in the analysis were collected in 2010 with the CMS detector at the LHC and correspond to an integrated ... -
Rapidity distributions in exclusive Z plus jet and gamma plus jet events in pp collisions at root s=7 TeV
Chatrchyan, S.; Işıldak, Bora (American Physical Society, 2013-12-01)Rapidity distributions are presented for events containing either a Z boson or a photon with a single jet in proton-proton collisions produced at the CERN LHC. The data, collected with the CMS detector at s√=7 TeV, ... -
A search for a doubly-charged Higgs boson in pp collisions at root s=7 TeV
Chatrchyan, S.; Işıldak, Bora (Springer Science+Business Media, 2012-11)A search for a doubly-charged Higgs boson in pp collisions at root s = 7 TeV is presented. The data correspond to an integrated luminosity of 4.9 fb(-1), collected by the CMS experiment at the LHC. The search is performed ...
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