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1.

001-es BibID:BIBFORM116587
035-os BibID:(cikkazonosító)60 (Scopus)85168275841 (WoS)001035579500001
Első szerző:CMS Collaboration
Cím:Search for top squarks in the four-body decay mode with single lepton final states in proton-proton collisions at root{s}=13 TeV / The CMS Collaboration
Dátum:2023
ISSN:1126-6708 1029-8479
Megjegyzések:A search for the pair production of the lightest supersymmetric partner of the top quark, the top squark ((t) over tilde (1)), is presented. The search targets the four-body decay of the (t) over tilde (1), which is preferred when the mass difference between the top squark and the lightest supersymmetric particle is smaller than the mass of the W boson. This decay mode consists of a bottom quark, two other fermions, and the lightest neutralino ( (x) over tilde (0)(1)), which is assumed to be the lightest supersymmetric particle. The data correspond to an integrated luminosity of 138 fb(-1) of proton-proton collisions at a center-of-mass energy of 13TeV collected by the CMS experiment at the CERN LHC. Events are selected using the presence of a high-momentum jet, an electron or muon with low transverse momentum, and a significant missing transverse momentum. The signal is selected based on a multivariate approach that is optimized for the difference between m( (t) over tilde (1)) and m( (x) over tilde (0)(1)). The contribution from leading background processes is estimated from data. No significant excess is observed above the expectation from standard model processes. The results of this search exclude top squarks at 95% confidence level for masses up to 480 and 700 GeV for m( (t) over tilde (1))- m( (x) over tilde (0)(1)) = 10 and 80 GeV, respectively.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Hadron-Hadron Scattering
Supersymmetry
Top Squark
Megjelenés:Journal of High Energy Physics. - 2023 : 6 (2023), p. 1-51. -
További szerzők:Tumasyan, Armen Adam, Wolfgang Andrejkovic, J.W. Raics Péter (1944-) (fizikus) Ujvári Balázs (1977-) (fizikus)
Pályázati támogatás:NKFIH K 124845
Egyéb
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2.

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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3.

001-es BibID:BIBFORM116668
035-os BibID:(cikkazonosító)137813 (Scopus)85167995430 (WoS)001053536800001
Első szerző:CMS Collaboration
Cím:Search for new heavy resonances decaying to WW, WZ, ZZ, WH, or ZH boson pairs in the all-jets final state in proton-proton collisions at root{s}=13 TeV / The CMS Collaboration
Dátum:2023
ISSN:0370-2693
Megjegyzések:A search for new heavy resonances decaying to WW, WZ, ZZ, WH, or ZH boson pairs in the all-jets final state is presented. The analysis is based on proton-proton collision data recorded by the CMS detector in 2016?2018 at a centre-of-mass energy of 13 TeV at the CERN LHC, corresponding to an integrated luminosity of 138 fb?1. The search is sensitive to resonances with masses between 1.3 and 6TeV, decaying to bosons that are highly Lorentz-boosted such that each of the bosons forms a single large-radius jet. Machine learning techniques are employed to identify such jets. No significant excess over the estimated standard model background is observed. A maximum local significance of 3.6 standard deviations, corresponding to a global significance of 2.3 standard deviations, is observed at masses of 2.1 and 2.9 TeV. In a heavy vector triplet model, spin-1 Z· and W· resonances with masses below 4.8TeV are excluded at the 95% confidence level (CL). These limits are the most stringent to date. In a bulk graviton model, spin-2 gravitons and spin-0 radions with masses below 1.4 and 2.7TeV, respectively, are excluded at 95% CL. Production of heavy resonances through vector boson fusion is constrained with upper cross section limits at 95% CL as low as 0.1 fb.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
CMS
Diboson resonances
Substructure
Megjelenés:Physics Letters B. - 844 (2023), p. 1-28. -
További szerzők:Tumasyan, Armen Adam, Wolfgang Andrejkovic, J.W. Raics Péter (1944-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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4.

001-es BibID:BIBFORM116695
035-os BibID:(cikkazonosító)057 (Scopus)85173980033 (WoS)001090955000001
Első szerző:CMS Collaboration
Cím:Search for a vector-like quark T0 ? tH via the diphoton decay mode of the Higgs boson in proton-proton collisions at ?s = 13 TeV / The CMS Collaboration
Dátum:2023
ISSN:1126-6708 1029-8479
Megjegyzések:A search for the electroweak production of a vector-like quark T·, decaying to a top quark and a Higgs boson is presented. The search is based on a sample of proton-proton collision events recorded at the LHC at = 13 TeV, corresponding to an integrated luminosity of 138 fb?1. This is the first T· search that exploits the Higgs boson decay to a pair of photons. For narrow isospin singlet T· states with masses up to 1.1 TeV, the excellent diphoton invariant mass resolution of 1?2% results in an increased sensitivity compared to previous searches based on the same production mechanism. The electroweak production of a T· quark with mass up to 960 GeV is excluded at 95% confidence level, assuming a coupling strength ?T = 0.25 and a relative decay width ?/MT· < 5%.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Beyond Standard Model
Hadron-Hadron Scattering
Top Physics
Megjelenés:Journal of High Energy Physics. - 2023 : 9 (2023), p. 1-39. -
További szerzők:Tumasyan, Armen Adam, Wolfgang Andrejkovic, J.W. Raics Péter (1944-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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5.

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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6.

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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7.

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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8.

001-es BibID:BIBFORM116740
035-os BibID:(Scopus)85113665013 (WoS)000713124400026 (cikkazonosító)136565
Első szerző:CMS Collaboration
Cím:First measurement of the cross section for top quark pair production with additional charm jets using dileptonic final states in pp collisions at / The CMS Collaboration
Dátum:2021
ISSN:0370-2693
Megjegyzések: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 proton-proton collisions at a centre-of-mass energy of 13 TeV. The data correspond to an integrated luminosity of 41.5 fb-1, recorded by the CMS experiment at the LHC. A new charm jet identification algorithm provides input to a neural network that is trained to distinguish among tt events with two additional charm (ttcc), bottom (ttbb), and light-flavour or gluon (ttLL) jets. By means of a template fitting procedure, the inclusive ttcc, ttbb, and ttLL cross sections are simultaneously measured, together with their ratios to the inclusive tt + two jets cross section. This provides measurements of the ttcc and ttbb cross sections of 10.1 +/- 1.2 (stat) +/- 1.4 (syst) pb and 4.54 +/- 0.35 (stat) +/- 0.56 (syst) pb, respectively, in the full phase space. The results are compared and found to be consistent with predictions from two different matrix element generators with next-to-leading order accuracy in quantum chromodynamics, interfaced with a parton shower simulation. (c) 2021 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.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Charm quark
Charm-tagging
CMS
Dilepton
Heavy-flavour
Top quark
Megjelenés:Physics Letters B. - 820 (2021), p. 1-30. -
További szerzők:Sirunyan, A. M. (fizikus) Tumasyan, Armen Adam, Wolfgang Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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9.

001-es BibID:BIBFORM116733
035-os BibID:(cikkazonosító)970 (Scopus)85118797403 (WOS)000714374500001
Első szerző:CMS Collaboration
Cím:Combined searches for the production of supersymmetric top quark partners in proton-proton collisions at ?s = 13 TeV / CMS Collaboration
Dátum:2021
ISSN:1434-6044
Megjegyzések:A combination of searches for top squark pair production using proton-proton collision data at a center-of-mass energy of 13 TeV at the CERN LHC, corresponding to an integrated luminosity of 137 fb(-1) collected by the CMS experiment, is presented. Signatures with at least 2 jets and large missing transverse momentum are categorized into events with 0, 1, or 2 leptons. New results for regions of parameter space where the kinematical properties of top squark pair production and top quark pair production are very similar are presented. Depending on themodel, the combined result excludes a top squarkmass up to 1325 GeV for amassless neutralino, and a neutralinomass up to 700 GeV for a top squarkmass of 1150 GeV. Top squarks with masses from 145 to 295 GeV, for neutralino masses from 0 to 100 GeV, with a mass difference between the top squark and the neutralino in a window of 30 GeV around the mass of the top quark, are excluded for the first time with CMS data. The results of theses searches are also interpreted in an alternative signal model of dark matter production via a spin-0 mediator in association with a top quark pair. Upper limits are set on the cross section for mediator particle masses of up to 420 GeV.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:European Physical Journal C. - 81 : 11 (2021), p. 1-35. -
További szerzők:Tumasyan, Armen Adam, Wolfgang Andrejkovic, J.W. Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
Pályázati támogatás:123842, 123959, 124845, 124850, 125105, 128713, 128786, and 129058
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10.

001-es BibID:BIBFORM116759
035-os BibID:(WoS)001060203600001 (Scopus)85167972224 (cikkazonsoító)137849
Első szerző:CMS Collaboration
Cím:Search for medium effects using jets from bottom quarks in PbPb collisions at sNN=5.02TeV / CMS Collaboration
Dátum:2023
ISSN:0370-2693
Megjegyzések:The first study of the shapes of jets arising from bottom (b) quarks in heavy ion collisions is presented. Jet shapes are studied using charged hadron constituents as a function of their radial distance from the jet axis. Lead-lead (PbPb) collision data at a nucleon-nucleon center-of-mass energy of ?sNN = 5.02 TeV were recorded by the CMS detector at the LHC, with an integrated luminosity of 1.69 nb?1 . Compared to proton-proton collisions, a redistribution of the energy in b jets to larger distances from the jet axis is observed in PbPb collisions. This medium-induced redistribution is found to be substantially larger for b jets than for inclusive jets.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
CMS
Beauty quark
b jets
Heavy ion
QGP
Jet quenching
Megjelenés:Physics Letters B. - 844 (2023), p. 1-22. -
További szerzők:Tumasyan, Armen Adam, Wolfgang Andrejkovic, J.W. Raics Péter (1944-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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11.

001-es BibID:BIBFORM116766
035-os BibID:(cikkazonosító)052002 (Scopus)85175427508 (WoS)001091059400002
Első szerző:CMS Collaboration
Cím:Reconstruction of decays to merged photons using end-to-end deep learning with domain continuation in the CMS detector / CMS Collaboration
Dátum:2023
ISSN:2470-0010 2470-0029
Megjegyzések:A novel technique based on machine learning is introduced to reconstruct the decays of highly Lorentz-boosted particles. Using an end-to-end deep learning strategy, the technique bypasses existing rule-based particle reconstruction methods typically used in high energy physics analyses. It uses minimally processed detector data as input and directly outputs particle properties of interest. The new technique is demonstrated for the reconstruction of the invariant mass of particles decaying in the CMS detector. The decay of a hypothetical scalar particle Formula Presented into two photons, Formula Presented, is chosen as a benchmark decay. Lorentz boosts Formula Presented are considered, ranging from regimes where both photons are resolved to those where the photons are closely merged as one object. A training method using domain continuation is introduced, enabling the invariant mass reconstruction of unresolved photon pairs in a novel way. The new technique is validated using Formula Presented decays in LHC collision data.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Physical Review D. - 108 : 5 (2023), p. 1-34. -
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:BIBFORM118461
035-os BibID:(Scopus)85179937139 (cikkazonosító)072004
Első szerző:CMS Collaboration
Cím:Search for the lepton-flavor violating decay of the Higgs boson and additional Higgs bosons in the e ? final state in proton-proton collisions at s = 13 TeV / CMS Collaboration
Dátum:2023
ISSN:2470-0010 2470-0029 0556-2821
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:PHYSICAL REVIEW D. - 108 : 7 (2023), p. 1-27. -
További szerzők:Ujvári Balázs (1977-) (fizikus) Raics Péter (1944-) (fizikus) Hayrapetyan, A. Tumasyan, Armen Adam, Wolfgang
Internet cím:DOI
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