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1.

001-es BibID:BIBFORM125657
035-os BibID:(WoS)001412689900001 (Scopus)85199979387
Első szerző:Tumasyan, Armen
Cím:Search for high-mass exclusive diphoton production with tagged protons in proton-proton collisions at root{s} = 13 TeV / A. Tumasyan,
Dátum:2024
ISSN:2470-0010 2470-0029
Megjegyzések:A search is presented for high-mass exclusive diphoton production via photon-photon fusion in proton-proton collisions at root s = 13 TeV in events where both protons survive the interaction. The analysis utilizes data corresponding to an integrated luminosity of 103 fb(-1) collected in 2016-2018 with the central CMS detector and the CMS and TOTEM precision proton spectrometer (PPS). Events that have two photons with high transverse momenta (p(T)(gamma) > 100 GeV), back-to-back in azimuth, and with a large diphoton invariant mass (m(gamma gamma) > 350 GeV) are selected. To remove the dominant inclusive diphoton backgrounds, the kinematic properties of the protons detected in PPS are required to match those of the central diphoton system. Only events having opposite-side forward protons detected with a fractional momentum loss between 0.035 and 0.15 (0.18) for the detectors on the negative (positive) side of CMS are considered. One exclusive diphoton candidate is observed for an expected background of 1.1 events. Limits at 95% confidence level are derived for the four-photon anomalous coupling parameters |zeta(1)| < 0.073 TeV-4 and |zeta(2)| < 0.15 TeV-4, using an effective field theory. Additionally, upper limits are placed on the production of axionlike particles with coupling strength to photons f(-1) that varies from 0.03 TeV-1 to 1 TeV-1 over the mass range from 500 to 2000 GeV.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Physical Review D. - 110 : 1 (2024), p. 1-28. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Ujvári Balázs (1977-) (fizikus) CMS Collaboration TOTEM Collaboration
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2.

001-es BibID:BIBFORM125556
035-os BibID:(WoS)001359714300001 (Scopus)85200751611
Első szerző:Tumasyan, Armen
Cím:Search for a scalar or pseudoscalar dilepton resonance produced in association with a massive vector boson or top quark-antiquark pair in multilepton events at root{s} = 13 TeV / A. Tumasyan, CMS Collaboration
Dátum:2024
ISSN:2470-0010 2470-0029
Megjegyzések:A search for beyond the standard model spin-0 bosons, phi, that decay into pairs of electrons, muons, or tau leptons is presented. The search targets the associated production of such bosons with a W or Z gauge boson, or a top quark-antiquark pair, and uses events with three or four charged leptons, including hadronically decaying tau leptons. The proton-proton collision data set used in the analysis was collected at the LHC from 2016 to 2018 at a center-of-mass energy of 13 TeV, and corresponds to an integrated luminosity of 138 fb(-1). The observations are consistent with the predictions from standard model processes. Upper limits are placed on the product of cross sections and branching fractions of such new particles over the mass range of 15 to 350 GeV with scalar, pseudoscalar, or Higgs-boson-like couplings, as well as on the product of coupling parameters and branching fractions. Several model-dependent exclusion limits are also presented. For a Higgs-boson-like phi model, limits are set on the mixing angle of the Higgs boson with the phi boson. For the associated production of a phi boson with a top quark-antiquark pair, limits are set on the coupling to top quarks. Finally, limits are set for the first time on a fermiophilic dilaton-like model with scalar couplings and a fermiophilic axion-like model with pseudoscalar couplings.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Physical Review D. - 110 : 1 (2024), p. 1-42. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Ujvári Balázs (1977-) (fizikus) Zilizi Gyula (1965-) (fizikus) CMS Collaboration
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3.

001-es BibID:BIBFORM125538
035-os BibID:(WoS)001290703500001 (Scopus)85199540386
Első szerző:Tumasyan, Armen
Cím:Observation of the Upsilon(3S) Meson and Suppression of Upsilon States in Pb-Pb Collisions at root{s_NN} = 5.02 TeV / A. Tumasyan, CMS Collaboration
Dátum:2024
ISSN:0031-9007
Megjegyzések:The production of gamma(2S) and gamma(3S) mesons in lead-lead (Pb-Pb) and proton-proton (pp) collisions is studied in their dimuon decay channel using the CMS detector at the LHC. The gamma(3S) meson is observed for the first time in Pb-Pb collisions, with a significance above 5 standard deviations. The ratios of yields measured in Pb-Pb and pp collisions are reported for both the gamma(2S) and gamma(3S) mesons, as functions of transverse momentum and Pb-Pb collision centrality. These ratios, when appropriately scaled, are significantly less than unity, indicating a suppression of gamma yields in Pb-Pb collisions. This suppression increases from peripheral to central Pb-Pb collisions. Furthermore, the suppression is stronger for gamma(3S) mesons compared to gamma(2S) mesons, extending the pattern of sequential suppression of quarkonium states in nuclear collisions previously seen for the J/psi, psi(2S), gamma(1S), and gamma(2S) mesons.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Physical Review Letters. - 133 : 2 (2024), p. 1-20. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Ujvári Balázs (1977-) (fizikus) CMS Collaboration
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4.

001-es BibID:BIBFORM122923
035-os BibID:(Scopus)85196770339
Első szerző:Tumasyan, Armen
Cím:Measurement of simplified template cross sections of the Higgs boson produced in association with W or Z bosons in the H --> bb decay channel in proton-proton collisions at root{s} = 13 TeV / A. Tumasyan, CMS Collaboration
Dátum:2024
ISSN:2470-0010 2470-0029
Megjegyzések:Differential cross sections are measured for the standard model Higgs boson produced in association with vector bosons (W, Z) and decaying to a pair of b quarks. Measurements are performed within the framework of the simplified template cross sections. The analysis relies on the leptonic decays of the W and Z bosons, resulting in final states with 0, 1, or 2 electrons or muons. The Higgs boson candidates are either reconstructed from pairs of resolved b-tagged jets, or from single large-radius jets containing the particles arising from two b quarks. Proton-proton collision data at root{s} = 13 TeV, collected by the CMS experiment in 2016-2018 and corresponding to a total integrated luminosity of 138 fb-1, are analyzed. The inclusive signal strength, defined as the product of the observed production cross section and branching fraction relative to the standard model expectation, combining all analysis categories, is found to be mu = 1.15+0.22-0.20. This corresponds to an observed (expected) significance of 6.3 (5.6) standard deviations.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Physical Review D. - 109 : 9 (2024), p. 1-35. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Ujvári Balázs (1977-) (fizikus) Zilizi Gyula (1965-) (fizikus) CMS Collaboration
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5.

001-es BibID:BIBFORM120542
035-os BibID:(WoS)000704610300001 (Scopus)85117586058
Első szerző:Tumasyan, Armen
Cím:Measurement of the electroweak production of Z[gamma] and two jets in proton-proton collisions at root{s} = 13 TeV and constraints on anomalous quartic gauge couplings / A. Tumasyan, CMS Collaboration
Dátum:2021
ISSN:2470-0010 2470-0029
Megjegyzések:The first observation of the electroweak (EW) production of a Z boson, a photon, and two forward jets (Z gamma jj) in proton-proton collisions at a center-of-mass energy of 13 TeV is presented. A data set corresponding to an integrated luminosity of 137 fb(-1), collected by the CMS experiment at the LHC in 2016-2018 is used. The measured fiducial cross section for EW Z gamma jj is sigma(Ew) = 5.21 +/- 0.52(stat)+/- 0.56(syst) fb = 5.21 +/- 0.76 fb. Single-differential cross sections in photon, leading lepton, and leading jet transverse momenta, and double-differential cross sections in mjj and vertical bar Delta eta(jj)vertical bar are also measured. Exclusion limits on anomalous quartic gauge couplings are derived at 95% confidence level in terms of the effective field theory operators M-0 to M-5, M-7, T-0 to T-2, and T-5 to T-9.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Physical Review D. - 104 : 7 (2021), p. 1-29. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus) CMS Collaboration
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6.

001-es BibID:BIBFORM120522
035-os BibID:(Scopus)85119446476 (WoS)000719845900006
Első szerző:Tumasyan, Armen
Cím:Measurements of the Electroweak Diboson Production Cross Sections in Proton-Proton Collisions at root{s} = 5.02 TeV Using Leptonic Decays / A. Tumasyan, CMS Collaboration
Dátum:2021
ISSN:0031-9007
Megjegyzések:The first measurements of diboson production cross sections in proton-proton interactions at a center-of-mass energy of 5.02 TeV are reported. They are based on data collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 302 pb-1. Events with two, three, or four charged light leptons (electrons or muons) in the final state are analyzed. The WW, WZ, and ZZ total cross sections are measured as ?WW=37.0-5.2+5.5(stat)-2.6+2.7(syst) pb, ?WZ=6.4-2.1+2.5(stat)-0.3+0.5(syst) pb, and ?ZZ=5.3-2.1+2.5(stat)-0.4+0.5(syst) pb. All measurements are in good agreement with theoretical calculations at combined next-to-next-to-leading order quantum chromodynamics and next-to-leading order electroweak accuracy.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Physical Review Letters. - 127 : 19 (2021), p. 1-19. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus) CMS Collaboration
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7.

001-es BibID:BIBFORM121299
035-os BibID:(WoS)001183209900005 (Scopus)85188217683
Első szerző:Tumasyan, Armen
Cím:Two-particle Bose-Einstein correlations and their Lévy parameters in PbPb collisions at root{s_NN} = 5.02 TeV / A. Tumasyan, CMS Collaboration
Dátum:2024
ISSN:2469-9985 2469-9993
Megjegyzések:Two-particle Bose-Einstein momentum correlation functions are studied for charged-hadron pairs in lead-lead collisions at a center-of-mass energy per nucleon pair of Formula Presented. The data sample, containing Formula Presented minimum bias events corresponding to an integrated luminosity of 0.607 Formula Presented, was collected by the CMS experiment in 2018. The experimental results are discussed in terms of a Lévy-type source distribution. The parameters of this distribution are extracted as functions of particle pair average transverse mass and collision centrality. These parameters include the Lévy index or shape parameter Formula Presented, the Lévy scale parameter Formula Presented, and the correlation strength parameter Formula Presented. The source shape, characterized by Formula Presented, is found to be neither Cauchy nor Gaussian, implying the need for a full Lévy analysis. Similarly to what was previously found for systems characterized by Gaussian source radii, a hydrodynamical scaling is observed for the Lévy Formula Presented parameter. The Formula Presented parameter is studied in terms of the core-halo model.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Physical Review C. - 109 : 2 (2024), p. 1-24. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Ujvári Balázs (1977-) (fizikus) Zilizi Gyula (1965-) (fizikus) CMS Collaboration
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8.

001-es BibID:BIBFORM120524
035-os BibID:(Scopus)85121314677 (WoS)000726017400004
Első szerző:Tumasyan, Armen
Cím:Measurement of differential t[overline]t production cross sections in the full kinematic range using lepton+jets events from proton-proton collisions at root{s} =13 TeV / A. Tumasyan, CMS Collaboration
Dátum:2021
ISSN:2470-0010 2470-0029
Megjegyzések:Measurements of differential and double-differential cross sections of top-quark pair (t[overline]t) production are presented in the lepton+jets channels with a single electron or muon and jets in the final state. The analysis combines for the first time signatures of top quarks with low transverse momentum p_T, where the top-quark decay products can be identified as separated jets and isolated leptons, and with high p_T, where the decay products are collimated and overlap. The measurements are based on proton-proton collision data at root{s}=13 TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 137 fb^-1. The cross sections are presented at the parton and particle levels, where the latter minimizes extrapolations based on theoretical assumptions. Most of the measured differential cross sections are well described by standard model predictions with the exception of some double-differential distributions. The inclusive t[overline]t production cross section is measured to be [sigma]_t[overline]t=791 +/- 25 pb, which constitutes the most precise measurement in the lepton+jets channel to date.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Physical Review D. - 104 : 9 (2021), p. 1-93. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus) CMS Collaboration
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9.

001-es BibID:BIBFORM120104
035-os BibID:(Scopus)85127560044 (WoS)000770948400001
Első szerző:Tumasyan, Armen
Cím:Measurement of W^+/-[gamma] differential cross sections in proton-proton collisions at root{s} = 13 TeV and effective field theory constraints / A. Tumasyan, CMS Collaboration
Dátum:2022
ISSN:2470-0010 2470-0029
Megjegyzések:Differential cross section measurements of W^+/-[gamma] production in proton-proton collisions at root{s}=13 TeV are presented. The data set used in this study was collected with the CMS detector at the CERN LHC in 2016-2018 with an integrated luminosity of 138 fb^-1. Candidate events containing an electron or muon, a photon, and missing transverse momentum are selected. The measurements are compared with standard model predictions computed at next-to-leading and next-to-next-to-leading orders in perturbative quantum chromodynamics. Constraints on the presence of TeV-scale new physics affecting the WW[gamma] vertex are determined within an effective field theory framework, focusing on the O_3W operator. A simultaneous measurement of the photon transverse momentum and the azimuthal angle of the charged lepton in a special reference frame is performed. This two-dimensional approach provides up to a factor of ten more sensitivity to the interference between the standard model and the O_3W contribution than using the transverse momentum alone.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Physical Review D. - 105 : 5 (2022), p. 1-34. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus) CMS Collaboration
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10.

001-es BibID:BIBFORM119646
035-os BibID:(Scopus)85132573375 (WoS)000811587900005
Első szerző:Tumasyan, Armen
Cím:Measurement of the production cross section for Z+b jets in proton-proton collisions at root{s} =13 TeV / A. Tumasyan, CMS Collaboration
Dátum:2022
ISSN:2470-0010 2470-0029
Megjegyzések:The measurement of the cross section for the production of a Z boson, decaying to dielectrons or dimuons, in association with at least one bottom quark jet is performed with proton-proton collision data at root{s}=13 TeV. The data sample corresponds to an integrated luminosity of 137 fb^-1, collected by the CMS experiment at the LHC during 2016-2018. The integrated cross sections for Z+>=1 b jet and Z+>=2 b jets are reported for the electron, muon, and combined channels. The fiducial cross sections in the combined channel are 6.52 +/- 0.04(stat) +/- 0.40(syst) +/- 0.14(theo) pb for Z+>=1 b jet and 0.65 +/- 0.03(stat) +/- 0.07(syst) +/- 0.02(theo) pb for Z+ ?2 b jets. The differential cross section distributions are measured as functions of various kinematic observables that are useful for precision tests of perturbative quantum chromodynamics predictions. The ratios of integrated and differential cross sections for Z+>=2b jets and Z+>=1 b jet processes are also determined. The value of the integrated cross section ratio measured in the combined channel is 0.100 +/- 0.005(stat) +/- 0.007(syst) +/- 0.003(theo). All measurements are compared with predictions from various event generators.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Physical Review D. - 105 : 9 (2022), p. 1-34. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus) CMS Collaboration
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11.

001-es BibID:BIBFORM120521
035-os BibID:(Scopus)85123372703 (WoS)000746218600010
Első szerző:Tumasyan, Armen
Cím:Search for long-lived particles decaying in the CMS End Cap Muon Detectors in proton-proton collisions at root{s} = 13 TeV / A. Tumasyan, CMS Collaboration
Dátum:2021
ISSN:0031-9007
Megjegyzések:A search for long-lived particles (LLPs) produced in decays of standard model (SM) Higgs bosons is presented. The data sample consists of 137 fb^-1 of proton-proton collisions at root{s}=13 TeV, recorded at the LHC in 2016-2018. A novel technique is employed to reconstruct decays of LLPs in the end cap muon detectors. The search is sensitive to a broad range of LLP decay modes and to masses as low as a few GeV. No excess of events above the SM background is observed. The most stringent limits to date on the branching fraction of the Higgs boson to LLPs subsequently decaying to quarks and [tau]^+[tau]^- are found for proper decay lengths greater than 6, 20, and 40 m, for LLP masses of 7, 15, and 40 GeV, respectively.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Charged particles
Data sample
Decay mode
End caps
Muon detectors
Novel techniques
Particle decay
Proton proton collisions
Standard-model Higgs bosons
Stringents
The standard model
Megjelenés:Physical Review Letters. - 127 : 26 (2021), p. 1-19. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus) CMS Collaboration
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12.

001-es BibID:BIBFORM119485
035-os BibID:(Scopus)85133908962 (WoS)000830403500012
Első szerző:Tumasyan, Armen
Cím:Inclusive nonresonant multilepton probes of new phenomena at root{s} = 13 TeV / A. Tumasyan, CMS Collaboration
Dátum:2022
ISSN:2470-0010 2470-0029
Megjegyzések:An inclusive search for nonresonant signatures of beyond the standard model (SM) phenomena in events with three or more charged leptons, including hadronically decaying [tau] leptons, is presented. The analysis is based on a data sample corresponding to an integrated luminosity of 138 fb^-1 of proton-proton collisions at root{s}=13 TeV, collected by the CMS experiment at the LHC in 2016-2018. Events are categorized based on the lepton and b-tagged jet multiplicities and various kinematic variables. Three scenarios of physics beyond the SM are probed, and signal-specific boosted decision trees are used for enhancing sensitivity. No significant deviations from the background expectations are observed. Lower limits are set at 95% confidence level on the mass of type-III seesaw heavy fermions in the range 845-1065 GeV for various decay branching fraction combinations to SM leptons. Doublet and singlet vectorlike [tau] lepton extensions of the SM are excluded for masses below 1045 GeV and in the mass range 125-150 GeV, respectively. Scalar leptoquarks decaying exclusively to a top quark and a lepton are excluded below 1.12-1.42 TeV, depending on the lepton flavor. For the type-III seesaw as well as the vectorlike doublet model, these constraints are the most stringent to date. For the vectorlike singlet model, these are the first constraints from the LHC experiments. Detailed results are also presented to facilitate alternative theoretical interpretations.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Proton-proton collisions
neutrino mass
scalar leptoquarks
underlying-event
pair production
lepton
search
fermion
number
quarks
Megjelenés:Physical Review D. - 105 : 11 (2022), p. 1-52. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus) CMS Collaboration
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