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1.

001-es BibID:BIBFORM120332
035-os BibID:(Scopus)85058100356 (WoS)000450549700001
Első szerző:Sirunyan, A. M. (fizikus)
Cím:Search for long-lived particles with displaced vertices in multijet eventsin proton-proton collisions at root{s}=13 TeV / Sirunyan, A. M., CMS Collaboration
Dátum:2018
ISSN:2470-0010 2470-0029
Megjegyzések:Results are reported from a search for long-lived particles in proton-proton collisions at root s = 13 TeV delivered by the CERN LHC and collected by the CMS experiment. The data sample, which was recorded during 2015 and 2016, corresponds to an integrated luminosity of 38.5 fb(-1). This search uses benchmark signal models in which long-lived particles are pair-produced and each decays into two or more quarks, leading to a signal with multiple jets and two displaced vertices composed of many tracks. No events with two well-separated high-track-multiplicity vertices are observed. Upper limits are placed on models of R-parity violating supersymmetry in which the long-lived particles are neutralinos or gluinos decaying solely into multijet final states or top squarks decaying solely into dijet final states. For neutralino, gluino, or top squark masses between 800 and 2600 GeV and mean proper decay lengths between 1 and 40 mm, the analysis excludes cross sections above 0.3 fb at 95% confidence level. Gluino and top squark masses are excluded below 2200 and 1400 GeV, respectively, for mean proper decay lengths between 0.6 and 80 mm. A method is provided for extending the results to other models with pair-produced long-lived particles.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
PP COLLISIONS
Megjelenés:Physical Review D. - 98 : 9 (2018), p. 1-25. -
További szerzők:Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus) CMS Collaboration
Pályázati támogatás:NKFIA 123842
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2.

001-es BibID:BIBFORM120227
035-os BibID:(Scopus)85057986772 (WoS)000451582500004
Első szerző:Sirunyan, A. M. (fizikus)
Cím:Evidence for the Associated Production of a Single Top Quarkand a Photon in Proton-Proton Collisions at root{s}=13 TeV / A. M. Sirunyan, CMS Collaboration
Dátum:2018
ISSN:0031-9007
Megjegyzések:The first evidence of events consistent with the production of a single top quark in association with a photon is reported. The analysis is based on proton-proton collisions at root s = 13 TeV and recorded by the CMS experiment in 2016, corresponding to an integrated luminosity of 35.9 fb(-1). Events are selected by requiring the presence of a muon (mu), a photon (gamma), an imbalance in transverse momentum from an undetected neutrino (nu), and at least two jets (j) of which exactly one is identified as associated with the hadronization of a b quark. A multivariate discriminant based on topological and kinematic event properties is employed to separate signal from background processes. An excess above the backgroundonly hypothesis is observed, with a significance of 4.4 standard deviations. A fiducial cross section is measured for isolated photons with transverse momentum greater than 25 GeV in the central region of the detector. The measured product of the cross section and branching fraction is sigma(pp -> t gamma j) B (t -> mu nu b) = 115 +/- 17 (stat) +/- 30(syst) fb, which is consistent with the standard model prediction.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Z-GAMMA
COUPLINGS
Megjelenés:Physical Review Letters. - 121 : 22 (2018), p. 1-18. -
További szerzők: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:BIBFORM119049
035-os BibID:(Scopus)85072103422 (WOS)000469020500001
Első szerző:Sirunyan, A. M. (fizikus)
Cím:Search for associated production of a Higgs boson and a single top quark in proton-proton collisions at root{s} = 13 TeV / A. M. Sirunyan, CMS Collaboration
Dátum:2019
ISSN:2470-0010 2470-0029
Megjegyzések:A search is presented for the production of a Higgs boson in association with a single top quark, based on data collected in 2016 by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV, which corresponds to an integrated luminosity of 35.9 fb(-1). The production cross section for this process is highly sensitive to the absolute values of the top quark Yukawa coupling, y(t); the Higgs boson coupling to vector bosons, g(HVV); and, uniquely, their relative sign. Analyses using multilepton signatures, targeting H -> WW, H -> tau tau, and H -> ZZ decay modes, and signatures with a single lepton and a b (b) over bar pair, targeting the H -> b (b) over bar decay, are combined with a reinterpretation of a measurement in the H -> gamma gamma channel to constrain y(t). For a standard model-like value of g(HVV), the data favor positive values of y(t) and exclude values of y(t) below about -0.9y(t)(SM).
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
PP COLLISIONS
Megjelenés:Physical Review D. - 99 : 9 (2019), 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
Pályázati támogatás:NKFIA 123842
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4.

001-es BibID:BIBFORM118961
035-os BibID:(Scopus)85070271666 (WOS)000471984900001
Első szerző:Sirunyan, A. M. (fizikus)
Cím:Measurements of the Higgs boson width and anomalous HVV couplings from on-shell and off-shell production in the four-lepton final state / A. M. Sirunyan, CMS Collaboration
Dátum:2019
ISSN:2470-0010 2470-0029
Megjegyzések:Studies of on-shell and off-shell Higgs boson production in the four-lepton final state are presented, using data from the CMS experiment at the LHC that correspond to an integrated luminosity of 80.2 fb(-1) at a center-of-mass energy of 13 TeV. Joint constraints are set on the Higgs boson total width and parameters that express its anomalous couplings to two electroweak vector bosons. These results are combined with those obtained from the data collected at center-of-mass energies of 7 and 8 TeV, corresponding to integrated luminosities of 5.1 and 19.7 fb(-1), respectively. Kinematic information from the decay particles and the associated jets are combined using matrix element techniques to identify the production mechanism and to increase sensitivity to the Higgs boson couplings in both production and decay. The constraints on anomalous HVV couplings are found to be consistent with the standard model expectation in both the on-shell and off-shell regions. Under the assumption of a coupling structure similar to that in the standard model, the Higgs boson width is constrained to be 3.2(-2.2)(+2.8)MeV while the expected constraint based on simulation is 4.1(-4.0)(+5.0) MeV. The constraints on the width remain similar with the inclusion of the tested anomalous HVV interactions.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
BROKEN SYMMETRIES
DECAYS
CONSTRAINTS
SPIN
ZZ
Megjelenés:Physical Review D. - 99 : 11 (2019), p. 1-33. -
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:NKFIA 123842
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5.

001-es BibID:BIBFORM118952
035-os BibID:(Scopus)85071199713 (WOS)000474894200007
Első szerző:Sirunyan, A. M. (fizikus)
Cím:Studies of Beauty Suppression via Nonprompt D^0 Mesons in Pb-Pb Collisions at root{S_{NN}}=5.02 TeV / A. M. Sirunyan, CMS Collaboration
Dátum:2019
ISSN:0031-9007
Megjegyzések:The transverse momentum spectra of D^0 mesons from b hadron decays are measured at midrapidity (|y| < 1) in pp and Pb-Pb collisions at a nucleon-nucleon center of mass energy of 5.02 TeV with the CMS detector at the LHC. The D-0 mesons from b hadron decays are distinguished from prompt D-0 mesons by their decay topologies. In Pb-Pb collisions, the B -> D^0 yield is found to be suppressed in the measured p(T) range from 2 to 100 GeV/c as compared to pp collisions. The suppression is weaker than that of prompt D-0 mesons and charged hadrons for p_T around 10 GeV/c. While theoretical calculations incorporating partonic energy loss in the quark-gluon plasma can successfully describe the measured B -> D-0 suppression at higher p(T), the data show an indication of larger suppression than the model predictions in the range of 2 < p_T < 5 GeV/c.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Binary alloys
Bosons
Energy dissipation
Hadrons
Quark-gluon plasma
Megjelenés:Physical Review Letters. - 123 : 2 (2019), p. 1-18. -
További szerzők: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:BIBFORM118943
035-os BibID:(Scopus)85071933340 (WOS)000478045600005
Első szerző:Sirunyan, A. M. (fizikus)
Cím:Centrality and pseudorapidity dependence of the transverse energy density in pPb collisions at root{s_NN}=5.02 TeV / A. M. Sirunyan, CMS Collaboration
Dátum:2019
ISSN:2469-9985 2469-9993
Megjegyzések:The almost hermetic coverage of the CMS detector is used to measure the distribution of transverse energy, E-T, over 13.2 units of pseudorapidity, eta, for pPb collisions at a center-of-mass energy per nucleon pair of root s(NN) = 5.02 TeV. The huge angular acceptance exploits the fact that the CASTOR calorimeter at -6.6 < eta < -5.2 is effectively present on both sides of the colliding system because of a switch in the proton-going and lead-going beam directions. This wide acceptance enables the study of correlations between well-separated angular regions and makes the measurement a particularly powerful test of event generators. For minimum bias pPb collisions the maximum value of dE(T)/d eta is 22 GeV, which implies an E-T per participant nucleon pair comparable to that of peripheral PbPb collisions at root s(NN) 7 = 2.76 TeV. The increase of dE(T)/d eta with centrality is much stronger for the lead-going side than for the proton-going side. The i dependence of dE(T)/d eta is sensitive to the eta range in which the centrality variable is defined. Several modern generators are compared to these results but none is able to capture all aspects of the eta and centrality dependence of the data and the correlations observed between different eta regions.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
PLUS AU COLLISIONS
P-PB COLLISIONS
RAPIDITY LOSS
MULTIPLICITY
COLLECTIVITY
Megjelenés:Physical Review C. - 100 : 2 (2019), p. 1-20. -
További szerzők:Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus) CMS Collaboration
Pályázati támogatás:NKFIA 123842
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7.

001-es BibID:BIBFORM118946
035-os BibID:(Scopus)85072104933 (WOS)000477896800001
Első szerző:Sirunyan, A. M. (fizikus)
Cím:Search for the production of W^{+/-}W^{+/-}W^{-/+} events at root{s}=13 TeV / A. M. Sirunyan, CMS Collaboration
Dátum:2019
ISSN:2470-0010 2470-0029
Megjegyzések:A search for the production of events containing three W bosons predicted by the standard model is reported. The search is based on a data sample of proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the CMS experiment at the CERN LHC and corresponding to a total integrated luminosity of 35.9 fb(-1). The search is performed in final states with three leptons (electrons or muons), or with two same-charge leptons plus two jets. The observed (expected) significance of the signal for (WWW -/+)-W-+/--W-+/- production is 0.60 (1.78) standard deviations, and the ratio of the measured signal yield to that expected from the standard model is 0.34(-0.34)(+0.62) . Limits are placed on three anomalous quartic gauge couplings and on the production of massive axionlike particles.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
HADRON COLLIDERS
CP CONSERVATION
Megjelenés:Physical Review D. - 100 : 1 (2019), p. 1-25. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Teyssier, Daniel Francois Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus) CMS Collaboration
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8.

001-es BibID:BIBFORM118929
035-os BibID:(cikkazonosító)052003 (WoS)000485196600002 (Scopus)85072931567
Első szerző:Sirunyan, A. M. (fizikus)
Cím:Search for vectorlike leptons in multilepton final states in proton-proton collisions at root{s}=13 TeV / A. M. Sirunyan, CMS Collaboration
Dátum:2019
ISSN:2470-0010 2470-0029
Megjegyzések:A search for vectorlike leptons in multilepton final states is presented. The data sample corresponds to an integrated luminosity of 77.4 fb^{-1} of proton-proton collisions at a center-of-mass energy of 13 TeV collected by the CMS experiment at the LHC in 2016 and 2017. Events are categorized by the multiplicity of electrons, muons, and hadronically decaying [tau] leptons. The missing transverse momentum and the scalar sum of the lepton transverse momenta are used to distinguish the signal from background. The observed results are consistent with the expectations from the standard model hypothesis. The existence of a vectorlike lepton doublet, coupling to the third-generation standard model leptons in the mass range of 120-790 GeV, is excluded at 95% confidence level. These are the most stringent limits yet on the production of a vectorlike lepton doublet, coupling to the third-generation standard model leptons.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Boson
Partons
Higgs Bosons
Megjelenés:Physical Review D. - 100 : 5 (2019), p. 1-8. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Teyssier, Daniel Francois Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus) CMS Collaboration
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9.

001-es BibID:BIBFORM108452
035-os BibID:(cikkazonosító)052004 (Wos)000704615300001 (Scopus)85116946295
Első szerző:Sirunyan, A. M. (fizikus)
Cím:Constraints on anomalous Higgs boson couplings to vector bosons and fermions in its production and decay using the four-lepton final state / A. M. Sirunyan, CMS Collaboration
Dátum:2021
ISSN:2470-0010 2470-0029
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Physical Review D. - 104 : 5 (2021), p. 1-51. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Zilizi Gyula (1965-) (fizikus) CMS Collaboration
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10.

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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11.

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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12.

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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