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1.

001-es BibID:BIBFORM120109
035-os BibID:(Scopus)85126414137 (WoS)000766949800004
Első szerző:Tumasyan, Armen
Cím:Measurement of the Inclusive and Differential Higgs Boson Production Cross Sections in the Decay Mode to a Pair of [tau] Leptons in pp Collisions at root{s}=13 TeV / A. Tumasyan, CMS Collaboration
Dátum:2022
ISSN:0031-9007
Megjegyzések:Measurements of the inclusive and differential fiducial cross sections of the Higgs boson are presented, using the [tau] lepton decay channel. The differential cross sections are measured as functions of the Higgs boson transverse momentum, jet multiplicity, and transverse momentum of the leading jet in the event, if any. The analysis is performed using proton-proton collision data collected with the CMS detector at the LHC at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 138 fb-1. These are the first differential measurements of the Higgs boson cross section in the final state of two [tau] leptons. In final states with a large jet multiplicity or with a Lorentz-boosted Higgs boson, these measurements constitute a significant improvement over measurements performed in other final states.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Decay channels
Decay mode
Differential cross-sections
Final state
Higgs boson
Measurements of
Production cross section
Proton proton collisions
Transverse momenta
Transverse momentum jets
Megjelenés:Physical Review Letters. - 128 : 8 (2022), 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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2.

001-es BibID:BIBFORM119216
035-os BibID:(cikkazonosító)092004 (WoS)001123626500003 (Scopus)85179176612
Első szerző:Tumasyan, Armen
Cím:First measurement of the forward rapidity gap distribution in p Pb collisions at root{s_NN}=8.16 TeV / A. Tumasyan, CMS Collaboration
Dátum:2023
ISSN:2470-0010 2470-0029
Megjegyzések: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 at a center-of-mass energy per nucleon pair of root{S_NN}=8.16 TeV, almost 300 times higher than in previous measurements of diffractive production in proton-nucleus collisions. For lead dissociation processes, which correspond to the pomeron-lead event topology, the EPOS-LHC generator predictions are a factor of 2 below the data, but the model gives a reasonable description of the rapidity gap spectrum shape. For the pomeron-proton topology, the EPOS-LHC, QGSJET II, and HIJING predictions are all at least a factor of 5 lower than the data. The latter effect might be explained by a significant contribution of ultraperipheral photoproduction events mimicking the signature of diffractive processes. These data may be of significant help in understanding the high energy limit of quantum chromodynamics and for modeling cosmic ray air showers.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Physical Review D. - 108 : 9 (2023), p. 1-25. -
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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3.

001-es BibID:BIBFORM116549
035-os BibID:(cikkazonosító)012011 (Scopus)85170495994 (WoS)001058584100001
Első szerző:Tumasyan, Armen
Cím:Search for direct pair production of supersymmetric partners of [tau] leptons in the final state with two hadronically decaying [tau] leptons and missing transverse momentum in proton-proton collisions at root{s}=13 TeV / A. Tumasyan, CMS Collaboration
Dátum:2023
ISSN:2470-0010 2470-0029
Megjegyzések:A search for the direct production of a pair of [tau] sleptons, the supersymmetric partners of [tau] leptons, is presented. Each [tau] slepton is assumed to decay to a [tau] 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 [tau] leptons, each decaying to one or more hadrons and a neutrino, and significant transverse momentum imbalance. In addition to scenarios in which the [tau] sleptons decay promptly, the search also addresses scenarios in which the [tau] sleptons have sufficiently long lifetimes to give rise to nonprompt [tau] 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 [tau] sleptons are obtained in the framework of simplified models. In a scenario in which the [tau] sleptons are superpartners of left-handed [tau] leptons, and each undergoes a prompt decay to a [tau] lepton and a nearly massless LSP, [tau] slepton masses between 115 and 340 GeV are excluded. In a scenario in which the lifetime of the [tau] sleptons corresponds to c[tau]_0 = 0.1 mm, where [tau]_0 represents the mean proper lifetime of the [tau] slepton, masses between 150 and 220 GeV are excluded.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Physical Review D. - 108 : 1 (2023), p. 1-30. -
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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4.

001-es BibID:BIBFORM116548
035-os BibID:(cikkazonosító)012009 (WoS)001062044600001 (Scopus)85173465206
Első szerző:Tumasyan, Armen
Cím:Search for narrow resonances in the b-tagged dijet mass spectrum in proton-proton collisions at root{s}=13 TeV / A. Tumasyan, CMS Collaboration
Dátum:2023
ISSN:2470-0010 2470-0029
Megjegyzések:A search is performed for narrow resonances decaying to final states of two jets, with at least one jet originating from a b quark, in proton-proton collisions at root{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.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Physical Review D. - 108 : 1 (2023), p. 1-22. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus) CMS Collaboration
Pályázati támogatás:NKFIH K 124845
Egyéb
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5.

001-es BibID:BIBFORM116097
035-os BibID:(cikkazonosító)032013 (WoS)001062081100001 (Scopus)85172851246
Első szerző:Tumasyan, Armen
Cím:Constraints on anomalous Higgs boson couplings to vector bosons and fermions from the production of Higgs bosons using the tt final state / A. Tumasyan, CMS Collaboration
Dátum:2023
ISSN:2470-0010 2470-0029
Megjegyzések:A study of anomalous couplings of the Higgs boson to vector bosons and fermions is presented. The data were recorded by the CMS experiment at a center-of-mass energy of pp collisions at the LHC of 13 TeV and correspond to an integrated luminosity of 138 fb-1. The study uses Higgs boson candidates produced mainly in gluon fusion or electroweak vector boson fusion at the LHC that subsequently decay to a pair of z leptons. Matrix-element and machine-learning techniques were employed in a search for anomalous interactions. The results are combined with those from the four-lepton and two-photon decay channels to yield the most stringent constraints on anomalous Higgs boson couplings to date. The pure CP-odd scenario of the Higgs boson coupling to gluons is excluded at 2.4 standard deviations. The results are consistent with the standard model predictions.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Physical Review D. - 108 : 3 (2023), p. 1-41. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus) CMS Collaboration
Pályázati támogatás:NKFIH K 124845
Egyéb
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6.

001-es BibID:BIBFORM116085
035-os BibID:(WoS)001102975600004 (Scopus)85168371955
Első szerző:Tumasyan, Armen
Cím:Azimuthal Correlations within Exclusive Dijets with Large Momentum Transfer in Photon-Lead Collisions / A. Tumasyan, CMS Collaboration
Dátum:2023
ISSN:0031-9007
Megjegyzések:The structure of nucleons is multidimensional and depends on the transverse momenta, spatial geometry, and polarization of the constituent partons. Such a structure can be studied using high-energy photons produced in ultraperipheral heavy-ion collisions. The first measurement of the azimuthal angular correlations of exclusively produced events with two jets in photon-lead interactions at large momentum transfer is presented, a process that is considered to be sensitive to the underlying nuclear gluon polarization. This study uses a data sample of ultraperipheral lead-lead collisions at s NN = 5.02 TeV , corresponding to an integrated luminosity of 0.38 nb - 1 , collected with the CMS experiment at the LHC. The measured second harmonic of the correlation between the sum and difference of the two jet transverse momentum vectors is found to be positive, and rising, as the dijet transverse momentum increases. A well-tuned model that has been successful at describing a wide range of proton scattering data from the HERA experiments fails to describe the observed correlations, suggesting the presence of gluon polarization effects.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Colliding beam accelerators
Heavy ions
Momentum
Momentum transfer
Polarization
Rutherford backscattering spectroscopy
Megjelenés:Physical Review Letters. - 131 : 5 (2023), p. 1-18. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus) CMS Collaboration
Pályázati támogatás:NKFIH
Egyéb
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7.

001-es BibID:BIBFORM116765
035-os BibID:(cikkazonosító)052004 (WoS)001085063900001 (Scopus)85175470307
Első szerző:Tumasyan, Armen
Cím:Measurement of differential cross sections for the production of a Z boson in association with jets in proton-proton collisions at root{s}=13 TeV / A. Tumasyan, CMS Collaboration
Dátum:2023
ISSN:2470-0010 2470-0029
Megjegyzések:A measurement is presented of the production of Formula Presented bosons that decay into two electrons or muons in association with jets, in proton-proton collisions at a center-of-mass energy of 13 TeV. The data were recorded by the CMS Collaboration at the LHC with an integrated luminosity of Formula Presented. The differential cross sections are measured as a function of the transverse momentum (Formula Presented) of the Formula Presented boson and the transverse momentum and rapidities of the five jets with largest Formula Presented. The jet multiplicity distribution is measured for up to eight jets. The hadronic activity in the events is estimated using the scalar sum of the Formula Presented of all the jets. All measurements are unfolded to the stable-particle level and compared with predictions from various Monte Carlo event generators, as well as with expectations at leading and next-to-leading orders in perturbative quantum chromodynamics.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Physical Review D. - 108 : 5 (2023), p. 1-37. -
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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8.

001-es BibID:BIBFORM116550
035-os BibID:(Scopus)85166640317 (WoS)001062444500003
Első szerző:CMS Collaboration
Cím:Measurement of the mass dependence of the transverse momentum of lepton pairs in Drell-Yan production in proton-proton collisions at root{s}=13 TeV / CMS Collaboration
Dátum:2023
ISSN:1434-6052
Megjegyzések:The double differential cross sections of the Drell?Yan lepton pair (?+?- , dielectron or dimuon) production are measured as functions of the invariant mass m? ? , transverse momentum pT(??) , and ??? . The ??? observable, derived from angular measurements of the leptons and highly correlated with pT(??) , is used to probe the low- pT(??) region in a complementary way. Dilepton masses up to 1 TeV are investigated. Additionally, a measurement is performed requiring at least one jet in the final state. To benefit from partial cancellation of the systematic uncertainty, the ratios of the differential cross sections for various m? ? ranges to those in the Z mass peak interval are presented. The collected data correspond to an integrated luminosity of 36.3 fb-1 of proton?proton collisions recorded with the CMS detector at the LHC at a centre-of-mass energy of 13 TeV . Measurements are compared with predictions based on perturbative quantum chromodynamics, including soft-gluon resummation.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:The European Physical Journal C. - 83 : 7 (2023), p. 1-49. -
További szerzők:Tumasyan, Armen Adam, Wolfgang Andrejkovic, J.W. Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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9.

001-es BibID:BIBFORM116659
035-os BibID:(cikkazonsoító)137905 (Scopus)85168004410 (WoS)001060187600001
Első szerző:CMS Collaboration
Cím:Two-particle azimuthal correlations in γp interactions using pPb collisions at root{s_NN}=8.16 TeV / The CMS Collaboration
Dátum:2023
ISSN:0370-2693
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
CMS
Photon-proton
Collectivity
Megjelenés:Physics Letters B. - 844 (2023), p. 1-24. -
További szerzők:Tumasyan, Armen Adam, Wolfgang Bergauer, T. Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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10.

001-es BibID:BIBFORM116729
035-os BibID:(Scopus)85119894636 (WoS)000721586700002
Első szerző:CMS Collaboration
Cím:Search for new particles in events with energetic jets and large missing transverse momentum in proton-proton collisions at root{s}=13 TeV / The CMS Collaboration
Dátum:2021
ISSN:1126-6708 1029-8479
Megjegyzések:A search is presented for new particles produced at the LHC in proton-proton collisions at root s = 13 TeV, using events with energetic jets and large missing transverse momentum. The analysis is based on a data sample corresponding to an integrated luminosity of 101 fb(-1), collected in 2017-2018 with the CMS detector. Machine learning techniques are used to define separate categories for events with narrow jets from initial-state radiation and events with large-radius jets consistent with a hadronic decay of a W or Z boson. A statistical combination is made with an earlier search based on a data sample of 36 fb(-1), collected in 2016. No significant excess of events is observed with respect to the standard model background expectation determined from control samples in data. The results are interpreted in terms of limits on the branching fraction of an invisible decay of the Higgs boson, as well as constraints on simplified models of dark matter, on first-generation scalar leptoquarks decaying to quarks and neutrinos, and on models with large extra dimensions. Several of the new limits, specifically for spin-1 dark matter mediators, pseudoscalar mediators, colored mediators, and leptoquarks, are the most restrictive to date.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Beyond Standard Model
Dark matter
Hadron-Hadron scattering (experiments)
Higgs physics
Megjelenés:Journal of High Energy Physics. - 2021 : 11 (2021), p. 1-72. -
További szerzők:Tumasyan, Armen Adam, Wolfgang Andrejkovic, J.W. Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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11.

001-es BibID:BIBFORM116736
035-os BibID:(Scopus)85118231834 (WoS)000711436000001 (cikkazonosító)174
Első szerző:CMS Collaboration
Cím:Measurements of the pp --> W^{+/-}[gamma][gamma] and pp --> Z[gamma][gamma] cross sections at root{s} = 13 TeV and limits on anomalous quartic gauge couplings / The CMS Collaboration
Dátum:2021
ISSN:1126-6708 1029-8479
Megjegyzések:The cross section for W or Z boson production in association with two photons is measured in proton-proton collisions at a centre-of-mass energy of 13 TeV. The data set corresponds to an integrated luminosity of 137 fb(-1) collected by the CMS experiment at the LHC. The W -> l nu and Z -> ll decay modes (where l = e, mu) are used to extract the W gamma gamma and Z gamma gamma cross sections in a phase space defined by electron (muon) with transverse momentum larger than 30 GeV and photon transverse momentum larger than 20 GeV. All leptons and photons are required to have absolute pseudorapidity smaller than 2.5. The measured cross sections in this phase space are sigma(W gamma gamma) = 13.6(-1.9)(+1.9) (stat)(-4.0)(+4.0) (syst) +/- 0.08 (PDF + scale) fb and sigma(Z gamma gamma) = 5.41(-0.55)(+0.58) (stat)(-0.70)(+0.64) (syst) +/- 0.06 (PDF + scale) fb. Limits on anomalous quartic gauge couplings are set in the framework of an effective field theory with dimension-8 operators.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Hadron-Hadron scattering (experiments)
Particle and resonance production
Megjelenés:Journal of High Energy Physics. - 2021 : 10 (2021), p. 1-39. -
További szerzők:Tumasyan, Armen Adam, Wolfgang Andrejkovic, J.W. Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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12.

001-es BibID:BIBFORM116737
035-os BibID:(Scopus)85117114706 (WoS)000706125100002
Első szerző:CMS Collaboration
Cím:Search for chargino-neutralino production in events with Higgs and W bosons using 137 fb^{-1} of proton-proton collisions at root{s}=13 TeV / The CMS Collaboration
Dátum:2021
ISSN:1126-6708 1029-8479
Megjegyzések:A search for electroweak production of supersymmetric (SUSY) particles in final states with one lepton, a Higgs boson decaying to a pair of bottom quarks, and large missing transverse momentum is presented. The search uses data from proton-proton collisions at a center-of-mass energy of 13 TeV collected using the CMS detector at the LHC, corresponding to an integrated luminosity of 137 fb(-1). The observed yields are consistent with backgrounds expected from the standard model. The results are interpreted in the context of a simplified SUSY model of chargino-neutralino production, with the chargino decaying to a W boson and the lightest SUSY particle (LSP) and the neutralino decaying to a Higgs boson and the LSP. Charginos and neutralinos with masses up to 820 GeV are excluded at 95% confidence level when the LSP mass is small, and LSPs with mass up to 350 GeV are excluded when the masses of the chargino and neutralino are approximately 700 GeV.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Hadron-Hadron scattering (experiments)
Higgs physics
Supersymmetry
Megjelenés:Journal of High Energy Physics. - 2021 : 10 (2021), p. 1-46. -
További szerzők:Tumasyan, Armen Adam, Wolfgang Andrejkovic, J.W. Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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