Browsing by Author "Sirunyan, A. M."
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Performance of reconstruction and identification of τ leptons decaying to hadrons and vτ in pp collisions at √s=13 TeV
Sirunyan, A. M.; Işıldak, Bora (IOP Publishing, 2018-10)The algorithm developed by the CMS Collaboration to reconstruct and identify tau leptons produced in proton-proton collisions at root s = 7 and 8 TeV, via their decays to hadrons and a neutrino, has been significantly ... -
Performance of the CMS Level-1 trigger in proton-proton collisions at √s = 13 TeV
Sirunyan, A. M.; Işıldak, Bora (2020-10)At the start of Run 2 in 2015, the LHC delivered proton-proton collisions at a center-ofmass energy of 13 TeV. During Run 2 (years 2015-2018) the LHC eventually reached a luminosity of 2.1 x 10(34) cm(-2) s(-1), almost ... -
Performance of the CMS muon trigger system in proton-proton collisions at √(s) = 13
Sirunyan, A. M.; Işıldak, Bora (IOP Publishing, 2021-07)The muon trigger system of the CMS experiment uses a combination of hardware and software to identify events containing a muon. During Run 2 (covering 2015-2018) the LHC achieved instantaneous luminosities as high as 2 × ... -
Performance of the reconstruction and identification of high-momentum muons in proton-proton collisions at √s = 13 TeV
Sirunyan, A. M.; Işıldak, Bora (IOP Publishing, 2020-02-28)The CMS detector at the LHC has recorded events from proton-proton collisions, with muon momenta reaching up to 1.8 TeV in the collected dimuon samples. These high-momentum muons allow direct access to new regimes in physics ... -
Pileup mitigation at CMS in 13 TeV data
Sirunyan, A. M.; Işıldak, Bora (IOP Publishing, 2020-09)With increasing instantaneous luminosity at the LHC come additional reconstruction challenges. At high luminosity, many collisions occur simultaneously within one proton-proton bunch crossing. The isolation of an interesting ... -
Precision luminosity measurement in proton–proton collisions at √s = 13 TeV in 2015 and 2016 at CMS
Sirunyan, A. M.; Işıldak, Bora (Springer, 2021-09-09)The measurement of the luminosity recorded by the CMS detector installed at LHC interaction point 5, using proton–proton collisions at s=13TeV in 2015 and 2016, is reported. The absolute luminosity scale is measured for ... -
Precision measurement of the structure of the CMS inner tracking system using nuclear interactions
Sirunyan, A. M.; Işıldak, Bora (IOP Publishing, 2018-10-29)The structure of the CMS inner tracking system has been studied using nuclear interactions of hadrons striking its material. Data from proton-proton collisions at a center-of-mass energy of 13 TeV recorded in 2015 at the ... -
The production of isolated photons in PbPb and pp collisions at √sNN = 5.02 TeV
Sirunyan, A. M.; Işıldak, Bora (Springer Nature, 2020-07-17)The transverse energy (ET gamma) spectra of photons isolated from other particles are measured using proton-proton (pp) and lead-lead (PbPb) collisions at the LHC at root s(NN) = 5.02 TeV with integrated luminosities of ... -
Production of Λc + baryons in proton-proton and lead-lead collisions at √sNN=5.02 TeV
Sirunyan, A. M.; Işıldak, Bora (Elsevier, 2020-04-10)The transverse momentum (P-T) spectra of inclusively produced A c P baryons are measured via the exclusive decay channel Lambda(+)(c) -> pK(-)pi(+) using the CMS detector at the LHC. Spectra are measured as a function of ... -
Pseudorapidity distributions of charged hadrons in xenon-xenon collisions at √sNN=5.44 TeV
Sirunyan, A. M.; Işıldak, Bora (Elsevier, 2019-12-10)Measurements of the pseudorapidity distributions of charged hadrons produced in xenon-xenon collisions at a nucleon-nucleon centre-of-mass energy of root S-NN = 5.44 TeV are presented. The measurements are based on data ... -
Reconstruction of signal amplitudes in the CMS electromagnetic calorimeter in the presence of overlapping proton-proton interactions
Sirunyan, A. M.; Işıldak, Bora (IOP Publishing, 2020-10)A template fitting technique for reconstructing the amplitude of signals produced by the lead tungstate crystals of the CMS electromagnetic calorimeter is described. This novel approach is designed to suppress the contribution ... -
Relative modification of prompt psi(2S) and J/psi yields from pp to PbPb collisions at root(S)(NN)=5.02 TeV
Sirunyan, A. M.; Işıldak, Bora (American Physical Society, 2017)The relative modification of the prompt psi(2S) and J/psi yields from pp to PbPb collisions, at the center-of- mass energy of 5.02 TeV per nucleon pair, is presented. The analysis is based on pp and PbPb data samples ... -
Relative modification of prompt ψ (2S) and J / ψ yields from pp to PbPb collisions at √sNN = 5.02 TeV
Sirunyan, A. M.; Işıldak, Bora (American Physical Society, 2017)The relative modification of the prompt ψð2SÞ and J=ψ yields from pp to PbPb collisions, at the centerof-mass energy of 5.02 TeV per nucleon pair, is presented. The analysis is based on pp and PbPb data samples collected ... -
Running of the top quark mass from proton-proton collisions at √s=13 TeV
Sirunyan, A. M.; Işıldak, Bora (Elsevier, 2020-04-10)The running of the top quark mass is experimentally investigated for the first time. The mass of the top quark in the modified minimal subtraction ((MS) over bar) renormalization scheme is extracted from a comparison of ... -
Search for a charged Higgs boson decaying into top and bottom quarks in events with electrons or muons in proton-proton collisions at √ s = 13 TeV
Sirunyan, A. M.; Işıldak, Bora (Springer Nature, 2020-01-16)A search is presented for a charged Higgs boson heavier than the top quark, produced in association with a top quark, or with a top and a bottom quark, and decaying into a top-bottom quark-antiquark pair. The search is ... -
Search for a charged Higgs boson decaying to charm and bottom quarks in proton-proton collisions at s√=8 TeV
Sirunyan, A. M.; Işıldak, Bora (Springer Nature, 2018-11)A search for charged Higgs boson decaying to a charm and a bottom quark (H +→ c b ¯) is performed using 19.7 fb−1 of pp collision data at s=8 TeV. The production mechanism investigated in this search is t t ¯ pair production ... -
Search for a heavy Higgs boson decaying to a pair of W bosons in proton-proton collisions at s√ = 13 TeV
Sirunyan, A. M.; Işıldak, Bora (Springer Nature, 2020-03-06)A search for a heavy Higgs boson in the mass range from 0.2 to 3.0 TeV, decaying to a pair of W bosons, is presented. The analysis is based on proton-proton collisions at = 13 TeV recorded by the CMS experiment at the LHC ... -
Search for a heavy pseudoscalar boson decaying to a Z and a Higgs boson at √s = 13 TeV
Sirunyan, A. M.; Işıldak, Bora (Springer Nature, 2019-07-03)A search is presented for a heavy pseudoscalar boson A decaying to a Z boson and a Higgs boson with mass of 125 GeV. In the final state considered, the Higgs boson decays to a bottom quark and antiquark, and the Z boson ... -
Search for a heavy pseudoscalar Higgs boson decaying into a 125 GeV Higgs boson and a Z boson in final states with two tau and two light leptons at s√ = 13 TeV
Sirunyan, A. M.; Işıldak, Bora (Springer Nature, 2020-03-11)A search is performed for a pseudoscalar Higgs boson, A, decaying into a 125 GeV Higgs boson h and a Z boson. The h boson is specifically targeted in its decay into a pair of tau leptons, while the Z boson decays into a ... -
Search for a heavy resonance decaying to a top quark and a vector-like top quark at √s=13 TeV
Sirunyan, A. M.; Işıldak, Bora (Springer International Publishing, 2017-09-13)A search is presented for massive spin-1 Z′ resonances decaying to a top quark and a heavy vector-like top quark partner T. The search is based on a 2.6 fb−1 sample of proton-proton collisions at 13 TeV collected with the ...
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