Browsing by Author "Işıldak, Bora"
Now showing items 101-120 of 931
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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 transverse-momentum- and pseudorapidity-dependent event-plane fluctuations in PbPb and p Pb collisions
Khachatryan, V.; Işıldak, Bora (American Physical Society, 2015-09)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 η of both particles and as a function of the ... -
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 ... -
Evidence for WW/WZ vector boson scattering in the decay channel ℓνqq produced in association with two jets in proton-proton collisions at √s = 13 TeVeV
Tumasyan, A.; Işıldak, Bora (Elsevier, 2022-11-10)Evidence is reported for electroweak (EW) vector boson scattering in the decay channel ℓνqq of two weak vector bosons WV (V=W or Z), produced in association with two parton jets. The search uses a data set of proton-proton ... -
Evidence for X(3872) in Pb-Pb collisions and studies of its prompt production at √s NN = 5.02 TeV
Sirunyan, A. M.; Işıldak, Bora (American Physical Society, 2022-01-19)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 √ s NN = 5.02 TeV ... -
Evidence of b-Jet quenching in PbPb collisions at root S-NN=2.76 TeV
Khachatryan, V.; Işıldak, Bora (American Physical Society, 2014-09-26)The production of jets associated to bottom quarks is measured for the first time in PbPb collisions at a center-of-mass energy of 2.76 TeV per nucleon pair. Jet spectra are reported in the transverse momentum (pT) range ... -
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 ... -
FACET: A new long-lived particle detector in the very forward region of the CMS experiment
Cerci, S.; Işıldak, Bora (Springer, 2022-06-20)We describe a proposal to add a set of very forward detectors to the CMS experiment for the high-luminosity era of the Large Hadron Collider to search for beyond the standard model long-lived particles, such as dark photons, ... -
First lattice calculation of charmed hadrons' electromagnetic form factors
Can, K. Utku; Erkol, Güray; Işıldak, Bora; Oka, M.; Takahashi, T. T. (IOP Publishing, 2014)Electromagnetic form factors of D and D* mesons and Ξcc, Σc, Ωc and Ωcc baryons are calculated in 2+1 flavor lattice QCD. As a by product of this calculation electric/magnetic charge radii and magnetic moments are extracted. ... -
First measurement of large area jet transverse momentum spectra in heavy-ion collisions
Sirunyan, A. M.; Işıldak, Bora (Springer, 2021-05-31)Jet production in lead-lead (PbPb) and proton-proton (pp) collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV 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 √s = 13 TeV
Sirunyan, A. M.; Işıldak, Bora (Elsevier, 2021-09-10)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 ... -
First measurement of the forward rapidity gap distribution in pPb collisions at √s NN = 8.16 TeV
Tumasyan, A.; Işıldak, Bora (American Physical Society, 2023-11-20)For the first time at LHC energies, the forward rapidity gap spectra from proton-lead collisions for both proton and lead dissociation processes are presented. The analysis is performed over 10.4 units of pseudorapidity ... -
First measurement of the top quark pair production cross section in proton-proton collisions at √s = 13.6 TeV
Tumasyan, A.; Işıldak, Bora (Springer, 2023-08-30)The first measurement of the top quark pair (t (t) over bar) production cross section in proton-proton collisions at root s = 13.6TeV is presented. Data recorded with the CMS detector at the CERN LHC in Summer 2022, ... -
First search for exclusive diphoton production at high mass with tagged protons in proton-proton collisions at √s = 13 TeV
Tumasyan, A.; Işıldak, Bora (American Physical Society, 2022-06-28)A search for exclusive two-photon production via photon exchange in proton-proton collisions, pp→pγγp with intact protons, is presented. The data correspond to an integrated luminosity of 9.4 fb-1 collected in 2016 using ... -
Forward-backward asymmetry of Drell-Yan lepton pairs in pp collisions at root s=7 TeV
Chatrchyan, S.; Işıldak, Bora (Elsevier, 2013-01-08)A measurement of the forward-backward asymmetry (A(FB)) of Drell-Yan lepton pairs in pp collisions at root s = 7 TeV is presented. The data sample, collected with the CMS detector, corresponds to an integrated luminosity ... -
Forward–backward asymmetry of Drell–Yan lepton pairs in pp collisions at √s = 8 TeV
V. Khachatryan; Işıldak, Bora (Springer Nature, 2016-06)A measurement of the forward–backward asymmetry AFB of oppositely charged lepton pairs ( μμ and ee ) produced via Z/γ∗ boson exchange in pp collisions at s√=8 TeV is presented. The data sample corresponds to an ... -
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 ... -
Hard color-singlet exchange in dijet events in proton-proton collisions at root √s = 13 TeV
Sirunyan, A. M.; Işıldak, Bora (2021-08-26)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 b-quark jets with the CMS experiment
Chatrchyan, S.; Işıldak, Bora (IOP Publishing, 2013-04)At the Large Hadron Collider, the identification of jets originating from b quarks is important for searches for new physics and for measurements of standard model processes. A variety of algorithms has been developed by ...
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