Profile URL: https://hdl.handle.net/20.500.13091/11678
Job Title:Dr. Öğr. Üyesi
Email Address:yguler@ktun.edu.tr
Main Affiliation:02.05. Department of Engineering Basic Sciences
Status: Current Staff
ORCID:
0000-0001-7598-5252
0000-0001-7598-5252Scopus ID:
6701680863
6701680863YÖK Akademik: BAA488F7A8799A51
Web of Science ID:
AAG-7833-2019
AAG-7833-2019Name Variants:
Guler Y. Guler, Y
187 results
Scholarly Output Search Results
Now showing 1 - 10 of 187
Article Citation - WoS: 8Citation - Scopus: 3Search for Baryon Number Violation in Top Quark Production and Decay Using Proton-Proton Collisions at Formula Presented(American Physical Society, 2024-06-13) Hayrapetyan, A.; Tumasyan, A.; Adam, W.; Andrejkovic, J.W.; Bergauer, T.; Chatterjee, S.; Damanakis, K.; Gürpınar Güler, Emine; Güler, Yalçın; Lee, Y.; Zhokin, A.A search is presented for baryon number violating interactions in top quark production and decay. The analysis uses data from proton-proton collisions at a center-of-mass energy of 13 TeV, collected with the CMS detector at the LHC with an integrated luminosity of Formula Presented. Candidate events are selected by requiring two oppositely charged leptons (electrons or muons) and exactly one jet identified as originating from a bottom quark. Multivariate discriminants are used to separate the signal from the background. No significant deviation from the standard model prediction is observed. Upper limits are placed on the strength of baryon number violating couplings. For the first time the production of single top quarks via baryon number violating interactions is studied. This allows the search to set the most stringent constraints to date on the branching fraction of the top quark decay to a lepton, an up-type quark (Formula Presented or Formula Presented), and a down-type quark (Formula Presented, Formula Presented, or Formula Presented). The results improve the previous bounds by 3 to 6 orders of magnitude based on the fermion flavor combination of the baryon number violating interactions. © 2024 CERN, for the CMS Collaboration.Article Citation - WoS: 1Citation - Scopus: 8Precision Measurement of the Z Boson Invisible Width in Pp Collisions Root S=13 Tev(Elsevier, 2023-07-01) Tumasyan, A.; Adam, W.; Andrejkovic, J. W.; Bergauer, T.; Chatterjee, S.; Damanakis, K.; Kyriacou, S.; Gürpınar Güler, Emine; Güler, Yalçın; Zhokin, A.A precise measurement of the invisible width of the Z boson produced in proton-proton collisions at a center-of-mass energy of 13 TeV is presented using data recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 36.3 fb-1. The result is obtained from a simultaneous fit to kinematic distributions for two data samples of Z boson plus jets: one dominated by Z boson decays to invisible particles and the other by Z boson decays to muon and electron pairs. The invisible width is measured to be 523 & PLUSMN; 3 (stat) & PLUSMN; 16 (syst) MeV. This result is the first precise measurement of the invisible width of the Z boson at a hadron collider, and is the single most precise direct measurement to date, competitive with the combined result of the direct measurements from the LEP experiments. & COPY; 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons .org /licenses /by /4 .0/). Funded by SCOAP3.Article Citation - WoS: 3Citation - Scopus: 4Observation of the Formula Presented Decay in Proton-Proton Collisions at Formula Presented(American Physical Society, 2024-06-06) Hayrapetyan, A.; Tumasyan, A.; Adam, W.; Andrejkovic, J.W.; Bergauer, T.; Chatterjee, S.; Damanakis, K.; Gürpınar Güler, Emine; Güler, Yalçın; Zhokin, A.The Formula Presented decay has been observed with a statistical significance in excess of five standard deviations. The analysis is based on an event sample of proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the CMS experiment in 2018 and corresponding to an integrated luminosity of Formula Presented. Normalizing to the Formula Presented decay mode leads to a branching fraction of Formula Presented, a value that is consistent with the standard model prediction. © 2024 CERN, for the CMS Collaboration.Article Citation - WoS: 19Citation - Scopus: 20Search for Narrow Resonances in the B-Tagged Dijet Mass Spectrum in Proton-Proton Collisions at √s=13 Tev(Amer Physical Soc, 2023-07-13) Tumasyan, A.; Adam, W.; Andrejkovic, J. W.; Bergauer, T.; Chatterjee, S.; Damanakis, K.; Dragicevic, M.; Gürpınar Güler, Emine; Güler, Yalçın; Zhokin, A.A search is performed for narrow resonances decaying to final states of two jets, with at least one jet ffiffioriginating from a b quark, in proton-proton collisions at p s = 13 TeV. The data set corresponds to an integrated luminosity of 138 fb-1 collected with the CMS detector at the LHC. Jets originating from energetic b hadrons are identified through a b-tagging algorithm that utilizes a deep neural network or the presence of a muon inside a jet. The invariant mass spectrum of jet pairs is well described by a smooth parametrization and no evidence for the production of new particles is observed. Upper limits on the production cross section are set for excited b quarks and other resonances decaying to dijet final states containing b quarks. These limits exclude at 95% confidence level models of Z' bosons with masses from 1.8 TeV to 2.4 TeV and of excited b quarks with masses from 1.8 TeV to 4.0 TeV. This is the most stringent exclusion of excited b quarks to date.Article Citation - WoS: 5Citation - Scopus: 12Search for New Physics Using Effective Field Theory in 13 Tev Pp Collision Events That Contain a Top Quark Pair and a Boosted Z or Higgs Boson(Amer Physical Soc, 2023-08-10) Tumasyan, A.; Adam, W.; Andrejkovic, J. W.; Bergauer, T.; Chatterjee, S.; Damanakis, K.; Dragicevic, M.; Gürpınar Güler, Emine; Güler, Yalçın; Zhokin, A.A data sample containing top quark pairs (tt over bar ) produced in association with a Lorentz-boosted Z or Higgs boson is used to search for signs of new physics using effective field theory. The data correspond to an integrated luminosity of 138 fb-1 of proton-proton collisions produced at a center-of-mass energy of 13 TeV at the LHC and collected by the CMS experiment. Selected events contain a single lepton and hadronic jets, including two identified with the decay of bottom quarks, plus an additional large-radius jet with high transverse momentum identified as a Z or Higgs boson decaying to a bottom quark pair. Machine learning techniques are employed to discriminate between tt over bar Z or tt over bar H events and events from background processes, which are dominated by tt over bar + jets production. No indications of new physics are observed. The signal strengths of boosted tt over bar Z and tt over bar H production are measured, and upper limits are placed on the tt over bar Z and tt over bar H differential cross sections as functions of the Z or Higgs boson transverse momentum. The effects of new physics are probed using a framework in which the standard model is considered to be the low-energy effective field theory of a higher energy scale theory. Eight possible dimension-six operators are added to the standard model Lagrangian, and their corresponding coefficients are constrained via fits to the data.Article Citation - WoS: 14Citation - Scopus: 25Search for Direct Pair Production of Supersymmetric Partners of Τ Leptons in the Final State With Two Hadronically Decaying Τ Leptons and Missing Transverse Momentum in Proton-Proton Collisions at √s=13 Tev(Amer Physical Soc, 2023-07-19) Tumasyan, A.; Adam, W.; Andrejkovic, J. W.; Bergauer, T.; Chatterjee, S.; Damanakis, K.; Dragicevic, M.; Gürpınar Güler, Emine; Güler, Yalçın; Zhokin, A.A search for the direct production of a pair of T sleptons, the supersymmetric partners of T leptons, is presented. Each T slepton is assumed to decay to a T lepton and the lightest supersymmetric particle (LSP), which is assumed to be stable and to not interact in the detector, leading to an imbalance in the total reconstructed transverse momentum. The search is carried out in events identified as containing two T leptons, each decaying to one or more hadrons and a neutrino, and significant transverse momentum imbalance. In addition to scenarios in which the T sleptons decay promptly, the search also addresses scenarios in which the T sleptons have sufficiently long lifetimes to give rise to nonprompt T leptons. The data were collected in proton-proton collisions at a center-of-mass energy of 13 TeV at the CERN LHC with the CMS detector in 2016-2018, and correspond to an integrated luminosity of 138 fb-1. No significant excess is seen with respect to standard model expectations. Upper limits on cross sections for the pair production of T sleptons are obtained in the framework of simplified models. In a scenario in which the T sleptons are superpartners of left-handed T leptons, and each undergoes a prompt decay to a T lepton and a nearly massless LSP, T slepton masses between 115 and 340 GeV are excluded. In a scenario in which the lifetime of the T sleptons corresponds to cT0 1/4 0.1 mm, where T0 represents the mean proper lifetime of the T slepton, masses between 150 and 220 GeV are excluded.Article Citation - WoS: 35Citation - Scopus: 41Search for Heavy Resonances Decaying To Ww, Wz, or Wh Boson Pairs in a Final State Consisting of a Lepton and a Large-Radius Jet in Proton-Proton Collisions at S =13 Tev(American Physical Society, 2022-02-25) Tumasyan, A.; Adam, W.; Andrejkovic, J.W.; Bergauer, T.; Chatterjee, S.; Dragicevic, M.; Güler, Yalçın; The CMS Collaboration; Vetens, W.A search for new heavy resonances decaying to pairs of bosons (WW, WZ, or WH) is presented. The analysis uses data from proton-proton collisions collected with the CMS detector at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 137 fb-1. One of the bosons is required to be a W boson decaying to an electron or muon and a neutrino, while the other boson is required to be reconstructed as a single jet with mass and substructure compatible with a quark pair from a W, Z, or Higgs boson decay. The search is performed in the resonance mass range between 1.0 and 4.5 TeV and includes a specific search for resonances produced via vector boson fusion. The signal is extracted using a two-dimensional maximum likelihood fit to the jet mass and the diboson invariant mass distributions. No significant excess is observed above the estimated background. Model-independent upper limits on the production cross sections of spin-0, spin-1, and spin-2 heavy resonances are derived as functions of the resonance mass and are interpreted in the context of bulk radion, heavy vector triplet, and bulk graviton models. The reported bounds are the most stringent to date. © 2022 CERN.Article Citation - WoS: 43Citation - Scopus: 56Constraints on Anomalous Higgs Boson Couplings To Vector Bosons and Fermions in Its Production and Decay Using the Four-Lepton Final State(AMER PHYSICAL SOC, 2021-09-17) Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Andrejkovic, J. W.; Bergauer, T.; Chatterjee, S.; Vetens, W.; Gürpınar Güler, Emine; Güler, Yalçın; The CMS CollaborationStudies of CP violation and anomalous couplings of the Higgs boson to vector bosons and fermions are presented. The data were acquired by the CMS experiment at the LHC and correspond to an integrated luminosity of 137 fb(-1) at a proton-proton collision energy of 13 TeV. The kinematic effects in the Higgs boson's four-lepton decay H -> 4l and its production in association with two jets, a vector boson, or top quarks are analyzed, using a full detector simulation and matrix element techniques to identify the production mechanisms and to increase sensitivity to the tensor structure of the Higgs boson interactions. A simultaneous measurement is performed of up to five Higgs boson couplings to electroweak vector bosons (HVV), two couplings to gluons (Hgg), and two couplings to top quarks (Htt). The CP measurement in the Htt interaction is combined with the recent measurement in the H -> gamma gamma channel. The results are presented in the framework of anomalous couplings and are also interpreted in the framework of effective field theory, including the first study of CP properties of the Htt and effective Hgg couplings from a simultaneous analysis of the gluon fusion and top-associated processes. The results are consistent with the standard model of particle physics.Article Citation - WoS: 41Citation - Scopus: 51Search for Higgs Boson Pair Production in the Four B Quark Final State in Proton-Proton Collisions at S =13 Tev(American Physical Society, 2022-08-18) Tumasyan, A.; Adam, W.; Andrejkovic, J.W.; Bergauer, T.; Chatterjee, S.; Damanakis, K.; Güler, Yalçın; The CMS Collaboration; Vetens, W.A search for pairs of Higgs bosons produced via gluon and vector boson fusion is presented, focusing on the four b quark final state. The data sample consists of proton-proton collisions at a center-of-mass energy of 13 TeV, collected with the CMS detector at the LHC, and corresponds to an integrated luminosity of 138 fb-1. No deviation from the background-only hypothesis is observed. A 95% confidence level upper limit on the Higgs boson pair production cross section is observed at 3.9 times the standard model prediction for an expected value of 7.8. Constraints are also set on the modifiers of the Higgs field self-coupling, ??, and of the coupling of two Higgs bosons to two vector bosons, ?2 V. The observed (expected) allowed intervals at the 95% confidence level are -2.3<??<9.4 (-5.0<??<12.0) and -0.1<?2 V<2.2 (-0.4<?2 V<2.5). These are the most stringent observed constraints to date on the HH production cross section and on the ?2 V coupling. © 2022 CERN.Article Citation - WoS: 5Citation - Scopus: 5Azimuthal Anisotropy of Dijet Events in Pbpb Collisions at √snn=5.02 Tev(SPRINGER, 2023-07-17) Tumasyan, A.; Adam, W.; Andrejkovic, J. W.; Bergauer, T.; Chatterjee, S.; Damanakis, K.; Dragicevic, M.; Gürpınar Güler, Emine; Güler, Yalçın; Zhokin, A.The path-length dependent parton energy loss within the dense partonic medium created in lead-lead collisions at a nucleon-nucleon center-of-mass energy of root s(NN) = 5.02TeV is studied by determining the azimuthal anisotropies for dijets with high transverse momentum. The data were collected by the CMS experiment in 2018 and correspond to an integrated luminosity of 1.69 nb(-1). For events containing back-to-back jets, correlations in relative azimuthal angle and pseudorapidity (eta) between jets and hadrons, and between two hadrons, are constructed. The anisotropies are expressed as the Fourier expansion coefficients v(n), n = 2-4 of these azimuthal distributions. The dijet v(n) values are extracted from long-range (1.5 < vertical bar Delta eta vertical bar < 2.5) components of these correlations, which suppresses the background contributions from jet fragmentation processes. Positive dijet v(2) values are observed which increase from central to more peripheral events, while the v(3) and v(4) values are consistent with zero within experimental uncertainties.
Research Topics
Domains
Physical Sciences
Fields
Physics and Astronomy
Subfields
Nuclear and High Energy Physics
Specific Research Areas
Particle physics theoretical and experimental studies
High-Energy Particle Collisions Research
Quantum Chromodynamics and Particle Interactions
Particle Detector Development and Performance
Dark Matter and Cosmic Phenomena
Sustainable Development Goals
9INDUSTRY, INNOVATION AND INFRASTRUCTURE
62
Research Products
7AFFORDABLE AND CLEAN ENERGY
8
Research Products
4QUALITY EDUCATION
7
Research Products
Documents
1066
Citations
53185
h-index
104
Documents
791
Citations
37354
Publication Collaboration
| Affiliation Name | Count |
|---|---|
| Institute of Nuclear Physics of Lyon | 1101 |
| RWTH Aachen University | 1083 |
| Institut de Recherche sur les Lois Fondamentales de l'Univers | 1072 |
| Laboratoire Leprince-Ringuet | 1065 |
| A. Alikhanyan National Laboratory | 1051 |
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Data obtained from OpenAlex
| Journal | Count |
|---|---|
| Journal of High Energy Physics | 52 |
| Physical Review Letters | 25 |
| Physical Review D | 25 |
| Physics Letters B | 19 |
| Journal Of High Energy Physics | 17 |
Current Page: 1 / 5
Scholarly Output
187
Articles
181
Views / Downloads
353/1049
Supervised MSc Theses
0
Supervised PhD Theses
0
WoS Citation Count
3145
Scopus Citation Count
4408
Patents
0
Projects
0
WoS Citations per Publication
16.82
Scopus Citations per Publication
23.57
Open Access Source
185
Supervised Theses
0
Scopus Quartile Distribution
Competency Cloud
