Browsing by Author "Sirunyan, A. M."
Now showing items 21-40 of 283
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Determination of the strong coupling constant αS(mZ) from measurements of inclusive W± and Z boson production cross sections in proton-proton collisions at √s = 7 and 8 TeV
Sirunyan, A. M.; Işıldak, Bora (Springer Nature, 2020-06-01)Twelve measurements of inclusive cross sections of W-+/- and Z boson production, performed in proton-proton collisions at centre-of-mass energies of 7 and 8 TeV, are compared with perturbative quantum chromodynamics ... -
Elliptic flow of charm and strange hadrons in high-multiplicity p+Pb collisions at sNN =8.16 TeV
Sirunyan, A. M.; Işıldak, Bora (American Physical Society, 2018-08-21)The elliptic azimuthal anisotropy coefficient (v2) is measured for charm (D0) and strange (KS0, Λ, Ξ-, and Ω-) hadrons, using a data sample of p+Pb collisions collected by the CMS experiment, at a nucleon-nucleon center-of-mass ... -
An embedding technique to determine ττ backgrounds in proton-proton collision data
Sirunyan, A. M.; Işıldak, Bora (IOP Publishing, 2019-06)An embedding technique is presented to estimate standard model tau tau backgrounds from data with minimal simulation input. In the data, the muons are removed from reconstructed mu mu events and replaced with simulated tau ... -
Erratum 2: Search for dark matter and unparticles in events with a Z boson and missing transverse momentum in proton-proton collisions at s√=13 TeV
Sirunyan, A. M.; Işıldak, Bora (Springer Nature, 2018-01)In the original paper, figure 10 was incorrect. The correct figure is shown below. Additionally, the unparticle entries in table 3, as well as figure 4 and 5 were labelled with incorrect values of ΛU. -
Erratum to: Search for dark matter and unparticles in events with a Z boson and missing transverse momentum in proton-proton collisions at √s = 13 TeV
Sirunyan, A. M.; Işıldak, Bora (Springer International Publishing, 2017-09-22)In the original paper, figure 10 was incorrect. -
Erratum to: Study of dijet events with a large rapidity gap between the two leading jets in pp collisions at s√ = 7 TeV
Sirunyan, A. M.; Işıldak, Bora (Springer Nature, 2020-05-18)This erratum corrects the dedication in the PDF version of the original published manuscript: diractive processes should be diffractive processes. Abstract: Events with no charged particles produced between the two leading ... -
Erratum: Search for a new scalar resonance decaying to a pair of Z bosons in proton-proton collisions at √s = 13 TeV
Sirunyan, A. M.; Işıldak, Bora (Springer Nature, 2019-03-22)In both panels of figure 11, the unit of the z axis was mistakenly written as pb when it should have been fb. The corrected versions are shown in figure 1. -
Event shape variables measured using multijet final states in proton-proton collisions at s√=13 TeV
Sirunyan, A. M.; Işıldak, Bora (Springer Nature, 2018-12-01)The study of global event shape variables can provide sensitive tests of predictions for multijet production in proton-proton collisions. This paper presents a study of several event shape variables calculated using jet ... -
Evidence for light-by-light scattering and searches for axion-like particles in ultraperipheral PbPb collisions at √sNN = 5.02 TeV
Sirunyan, A. M.; Işıldak, Bora (Elsevier, 2019-10-10)Evidence for the light-by-light scattering process, gamma gamma -> gamma gamma, in ultraperipheral PbPb collisions at a centre-of-mass energy per nucleon pair of 5.02 TeV is reported. The analysis is conducted using a data ... -
Evidence for light-by-light scattering in ultraperipheral PbPb collisions at √sNN = 5.02 TeV
d'Enterria, D.; Sirunyan, A. M.; Işıldak, Bora (Elsevier, 2019-02)Evidence for light-by-light (LbL) scattering, gamma gamma -> gamma gamma, in ultraperipheral PbPb collisions at a nucleon-nucleon center of-mass energy of 5.02 TeV is reported. LbL scattering processes are selected in ... -
Evidence for the associated production of a single top quark and a photon in proton-proton collisions at √s = 13 TeV
Sirunyan, A. M.; Işıldak, Bora (American Physical Society, 2018-11-29)The first evidence of events consistent with the production of a single top quark in association with a photon is reported. The analysis is based on proton-proton collisions at s=13 TeV and recorded by the CMS experiment ... -
Evidence for top quark production in nucleus-nucleus collisions
Sirunyan, A. M.; Işıldak, Bora (American Physical Society, 2020-11-24)Ultrarelativistic heavy ion collisions recreate in the laboratory the thermodynamical conditions prevailing in the early universe up to 10(-6) sec, thereby allowing the study of the quark-gluon plasma (QGP), a state of ... -
Evidence for WW production from double-parton interactions in proton–proton collisions at s√=13TeV
Sirunyan, A. M.; Işıldak, Bora (Springer Nature, 2020-01-17)A search forWWproduction from double-parton scattering processes using same-charge electron-muon and dimuon events is reported, based on proton-proton collision data collected at a center-of-mass energy of 13 TeV. The ... -
Experimental study of different silicon sensor options for the upgrade of the CMS Outer Tracker
Sirunyan, A. M.; Işıldak, Bora (IOP Publishing, 2020-04)During the high-luminosity phase of the LHC (HL-LHC), planned to start in 2027, the accelerator is expected to deliver an instantaneous peak luminosity of up to 7.5 x 10(34) cm(-2) s(-1). A total integrated luminosity of ... -
Extraction and validation of a new set of CMS PYTHIA8 tunes from underlying-event measurements
Sirunyan, A. M.; Işıldak, Bora (Springer Nature, 2020-01-03)New sets of CMS underlying-event parameters ("tunes") are presented for the pythia8 event generator. These tunes use the NNPDF3.1 parton distribution functions (PDFs) at leading (LO), next-to-leading (NLO), or next-to-ne ... -
Fragmentation of J/ψ in jets in pp collisions at √s = 5.02 TeV
Diab, B.; Sirunyan, A. M.; Işıldak, Bora (Elsevier, 2019-02)The fragmentation of jets containing a J/psi meson is studied in root s = 5.02 TeV pp data using an integrated luminosity of L = 27.39 pb(-1). The fraction of the jet transverse momentum p(Tjet) carried by the J/psi is ... -
Identification of heavy, energetic, hadronically decaying particles using machine-learning techniques
Sirunyan, A. M.; Işıldak, Bora (IOP Publishing, 2020-06)Machine-learning (ML) techniques are explored to identify and classify hadronic decays of highly Lorentz-boosted W/Z/Higgs bosons and top quarks. Techniques without ML have also been evaluated and are included for comparison. ... -
Inclusive search for highly boosted Higgs bosons decaying to bottom quark-antiquark pairs in proton-proton collisions at s√ = 13 TeV
Sirunyan, A. M.; Işıldak, Bora (Springer Nature, 2020-12-11)A search for standard model Higgs bosons (H) produced with transverse momentum (pT) greater than 450 GeV and decaying to bottom quark-antiquark pairs (b b ¯) is performed using proton-proton collision data collected by the ... -
Inclusive search for supersymmetry in pp collisions at s√ = 13 TeV using razor variables and boosted object identification in zero and one lepton final states
Sirunyan, A. M.; Işıldak, Bora (Springer Nature, 2019-03-06)An inclusive search for supersymmetry (SUSY) using the razor variables is performed using a data sample of proton-proton collisions corresponding to an integrated luminosity of 35.9 fb(-1), collected with the CMS experiment ... -
Investigation into the event-activity dependence of ϒ(nS) relative production in proton-proton collisions at s√ = 7 TeV
Sirunyan, A. M.; Işıldak, Bora (Springer Nature, 2020-11-02)The ratios of the production cross sections between the excited gamma(2S) and gamma(3S) mesons and the gamma(1S) ground state, detected via their decay into two muons, are studied as a function of the number of charged ...
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