Yazar "Tumasyan, A." için listeleme
-
Evidence for Higgs boson decay to a pair of muons
Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Asilar, E.; Bergauer, T.; Özdemir, Kadri; CMS Collaboration (Springer, 2021)Evidence for Higgs boson decay to a pair of muons is presented. This result combines searches in four exclusive categories targeting the production of the Higgs boson via gluon fusion, via vector boson fusion, in association ... -
Evidence for light-by-light scattering and searches for axion-like particles in ultraperipheral PbPb collisions at root s(NN)=5.02 TeV
Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Bergauer, T.; Brandstetter, J.; Özdemir, Kadri; CMS Collaboration (Elsevier, 2019)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 root S-NN=5.02 TeV
d'Enterria, David; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Asilar, E.; Özdemir, Kadri; CMS Collaboration (Elsevier, 2019)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 root s=13 TeV
Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Asilar, E.; Bergauer, T.; Özdemir, Kadri; CMS Collaboration (Amer Physical Soc, 2018)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 root s = 13 TeV and recorded by the CMS ... -
Evidence for the Higgs boson decay to a bottom quark-antiquark pair
Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Asilar, E.; Bergauer, T.; Özdemir, Kadri; CMS Collaboration (Elsevier, 2018)A search for the standard model (SM) Higgs boson (H) decaying to b(b)over-bar when produced in association with an electroweak vector boson is reported for the following processes: Z(vv)H, W(mu v)H, W(ev)H, Z(mu mu)H, and ... -
Evidence for Top Quark Production in Nucleus-Nucleus Collisions
Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Bergauer, T.; Dragicevic, M.; Özdemir, Kadri; CMS Collaboration (Amer Physical Soc, 2020)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 transverse-momentum- and pseudorapidity-dependent event-plane fluctuations in PbPb and pPb collisions
Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Özdemir, Kadri; CMS Collaboration (Amer Physical Soc, 2015)A systematic study of the factorization of long-range azimuthal two-particle correlations into a product of single-particle anisotropies is presented as a function of pT and nu of both particles and as a function of the ... -
Evidence for WW production from double-parton interactions in proton-proton collisions at root s=13 TeV
Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Bergauer, T.; Brandstetter, J.; Özdemir, Kadri; CMS Collaboration (Springer, 2020)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 ... -
Evidence for X(3872) in Pb-Pb Collisions and Studies of its Prompt Production at sNN =5.02 TeV
Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Ambrogi,F.; Özdemir, Kadri; CMS Collaboration (American Physical Society, 2022)The first evidence for X(3872) production in relativistic heavy ion collisions is reported. The X(3872) production is studied in lead-lead (Pb-Pb) collisions at a center-of-mass energy of sNN=5.02 TeV per nucleon pair, ... -
Experimental study of different silicon sensor options for the upgrade of the CMS Outer Tracker
Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Asilar, E.; Bergauer, T.; Özdemir, Kadri; CMS Collaboration (Iop Publishing Ltd, 2020)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.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Asilar, E.; Bergauer, T.; Özdemir, Kadri; CMS Collaboration (Springer, 2020)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 ... -
First measurement of large area jet transverse momentum spectra in heavy-ion collisions
Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Ambrogi,F.; Özdemir, Kadri; CMS Collaboration (Springer, 2021)Jet production in lead-lead (PbPb) and proton-proton (pp) collisions at a nucleon-nucleon center-of-mass energy of 5.02TeV is studied with the CMS detector at the LHC, using PbPb and pp data samples corresponding to ... -
First measurement of the cross section for top quark pair production with additional charm jets using dileptonic final states in pp collisions at root s=13 TeV
Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Bergauer, T.; Özdemir, Kadri; CMS Collaboration (Elsevier, 2021)The first measurement of the inclusive cross section for top quark pairs (tt) produced in association with two additional charm jets is presented. The analysis uses the dileptonic final states of tt events produced in ... -
Forward-backward asymmetry of Drell-Yan lepton pairs in pp collisions at root s=8 TeV
Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Özdemir, Kadri; CMS Collaboration (Springer, 2016)A measurement of the forward-backward asymmetry A(FB) of oppositely charged lepton pairs (mu mu and ee) produced via Z/gamma* boson exchange in pp collisions at root s = 8 TeV is presented. The data sample corresponds to ... -
Fragmentation of J/psi in jets in pp collisions at root s=5.02 TeV Batoul Diab for the CMS collaboration
Diab, Batoul; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Asilar, E.; Özdemir, Kadri; CMS Collaboration (Elsevier, 2019)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 ... -
Hard color-singlet exchange in dijet events in proton-proton collisions at root s=13 TeV
Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Ambrogi,F.; Özdemir, Kadri (American Physical Society, 2021)Events where the two leading jets are separated by a pseudorapidity interval devoid of particle activity, known as jet-gap-jet events, are studied in proton-proton collisions at root s = 13 TeV. The signature is expected ... -
Identification of hadronic tau lepton decays using a deep neural network
Tumasyan, A.; Adam, W.; Andrejkovic, J.W.; Bergauer, T.; Özdemir, Kadri; CMS Collaboration (IOP Publishing, 2022)new algorithm is presented to discriminate reconstructed hadronic decays of tau leptons (τ h) that originate from genuine tau leptons in the CMS detector against τ h candidates that originate from quark or gluon jets, ... -
Identification of heavy, energetic, hadronically decaying particles using machine-learning techniques
Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Bergauer, T.; Brandstetter, J.; Özdemir, Kadri; CMS Collaboration (Iop Publishing Ltd, 2020)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. ... -
Identification of heavy-flavour jets with the CMS detector in pp collisions at 13 TeV
Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Asilar, E.; Bergauer, T.; Özdemir, Kadri; CMS Collaboration (Iop Publishing Ltd, 2018)Many measurements and searches for physics beyond the standard model at the LHC rely on the efficient identification of heavy-flavour jets, i.e. jets originating from bottom or charm quarks. In this paper, the discriminating ... -
Inclusive and differential cross section measurements of single top quark production in association with a Z boson in proton-proton collisions at √s = 13 TeV
Tumasyan, A.; Adam, W.; Andrejkovic, J.W.; Bergauer, T.; CMS Collaboration; Özdemir, Kadri (Springer, 2022)Inclusive and differential cross sections of single top quark production in association with a Z boson are measured in proton-proton collisions at a center-of-mass energy of 13 TeV with a data sample corresponding to an ...
