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1.

001-es BibID:BIBFORM022803
035-os BibID:(cikkazonosító)091 (WoS)000282371300025 (Scopus)78649809111
Első szerző:Chatrchyan, S.
Cím:Observation of Long-Range Near-Side Angular Correlations in Proton-Proton Collisions at the LHC / S. Chatrchyan on behalf of The CMS Collaboration
Dátum:2010
ISSN:1029-8479
Megjegyzések:Results on two-particle angular correlations for charged particles emitted in proton-proton collisions at center-of-mass energies of 0.9, 2.36, and 7 TeV are presented, using data collected with the CMS detector over a broad range of pseudorapidity (eta) and azimuthal angle (phi). Short-range correlations in Delta(eta), which are studied in minimum bias events, are characterized using a simple "independent cluster" parametrization in order to quantify their strength (cluster size) and their extent in eta (cluster decay width). Long-range azimuthal correlations are studied differentially as a function of charged particle multiplicity and particle transverse momentum using a 980 inverse nb data set at 7 TeV. In high multiplicity events, a pronounced structure emerges in the two-dimensional correlation function for particle pairs with intermediate transverse momentum of 1-3 GeV/c, 2.0< |Delta(eta)| <4.8 and Delta(phi) near 0. This is the first observation of such a long-range, near-side feature in two-particle correlation functions in pp or p p-bar collisions.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Journal Of High Energy Physics. - 9 (2010), p. 1-38. -
További szerzők:Trócsányi Zoltán (1961-) (fizikus) Pálinkás József (1952-) (fizikus) Ujvári Balázs (1977-) (fizikus) The CMS Collaboration
Internet cím:DOI
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2.

001-es BibID:BIBFORM022819
035-os BibID:(cikkazonosító)041 (WoS)000275223100041 (Scopus)84856375650
Első szerző:Chatrchyan, S.
Cím:Transverse momentum and pseudorapidity distributions of charged hadrons in pp collisions at sqrt(s) = 0.9 and 2.36 TeV / S. Chatrchyan on behalf of The CMS Collaboration
Dátum:2010
ISSN:1029-8479
Megjegyzések:Measurements of inclusive charged-hadron transverse-momentum and pseudorapidity distributions are presented for proton-proton collisions at sqrt(s) = 0.9 and 2.36 TeV. The data were collected with the CMS detector during the LHC commissioning in December 2009. For non-single-diffractive interactions, the average charged-hadron transverse momentum is measured to be 0.46 +/- 0.01 (stat.) +/- 0.01 (syst.) GeV/c at 0.9 TeV and 0.50 +/- 0.01 (stat.) +/- 0.01 (syst.) GeV/c at 2.36 TeV, for pseudorapidities between -2.4 and +2.4. At these energies, the measured pseudorapidity densities in the central region, dN(charged)/d(eta) for |eta| < 0.5, are 3.48 +/- 0.02 (stat.) +/- 0.13 (syst.) and 4.47 +/- 0.04 (stat.) +/- 0.16 (syst.), respectively. The results at 0.9 TeV are in agreement with previous measurements and confirm the expectation of near equal hadron production in p-pbar and pp collisions. The results at 2.36 TeV represent the highest-energy measurements at a particle collider to date.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Journal Of High Energy Physics. - 2 (2010), p. 1-33. -
További szerzők:Trócsányi Zoltán (1961-) (fizikus) Pálinkás József (1952-) (fizikus) Ujvári Balázs (1977-) (fizikus) The CMS Collaboration
Internet cím:DOI
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3.

001-es BibID:BIBFORM119073
035-os BibID:(Scopus)85066067505 (WOS)000468428300001
Első szerző:ATLAS Collaboration
Cím:Combinations of single-top-quark production cross-section measurements and |f(LV)V(tb)| determinations at root{s} = 7 and 8 TeV with the ATLAS and CMS experiments / ATLAS and CMS Collaborations
Dátum:2019
ISSN:1126-6708 1029-8479
Megjegyzések:This paper presents the combinations of single-top-quark production cross-section measurements by the ATLAS and CMS Collaborations, using data from LHC proton-proton collisions at = 7 and 8 TeV corresponding to integrated luminosities of 1.17 to 5.1 fb(-1) at = 7 TeV and 12.2 to 20.3 fb(-1) at = 8 TeV. These combinations are performed per centre-of-mass energy and for each production mode: t-channel, tW, and s-channel. The combined t-channel cross-sections are 67.5 +/- 5.7 pb and 87.7 +/- 5.8 pb at = 7 and 8 TeV respectively. The combined tW cross-sections are 16.3 +/- 4.1 pb and 23.1 +/- 3.6 pb at = 7 and 8 TeV respectively. For the s-channel cross-section, the combination yields 4.9 +/- 1.4 pb at = 8 TeV. The square of the magnitude of the CKM matrix element V-tb multiplied by a form factor f(LV) is determined for each production mode and centre-of-mass energy, using the ratio of the measured cross-section to its theoretical prediction. It is assumed that the top-quark-related CKM matrix elements obey the relation |V-td|, |V-ts| << |V-tb|. All the |f(LV)V(tb)|(2) determinations, extracted from individual ratios at = 7 and 8 TeV, are combined, resulting in |f(LV)V(tb)| = 1.02 +/- 0.04 (meas.) +/- 0.02 (theo.). All combined measurements are consistent with their corresponding Standard Model predictions.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Hadron-Hadron scattering (experiments)
Megjelenés:Journal of High Energy Physics. - 2019 : 5 (2019), p. 1-81. -
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:BIBFORM119347
035-os BibID:(Scopus)85065134466 (WOS)000465183000001
Első szerző:CMS Collaboration
Cím:Search for contact interactions and large extra dimensions in the dilepton mass spectra from proton-proton collisions at root{s} = 13 TeV / CMS collaboration
Dátum:2019
ISSN:1126-6708 1029-8479
Megjegyzések:A search for nonresonant excesses in the invariant mass spectra of electron and muon pairs is presented. The analysis is based on data from proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the CMS experiment in 2016, corresponding to a total integrated luminosity of 36 fb(-1). No significant deviation from the standard model is observed. Limits are set at 95% confidence level on energy scales for two general classes of nonresonant models. For a class of fermion contact interaction models, lower limits ranging from 20 to 32 TeV are set on the characteristic compositeness scale [lambda]. For the Arkani-Hamed, Dimopoulos, and Dvali model of large extra dimensions, the first results in the dilepton final state at 13 TeV are reported, and values of the ultraviolet cutoff parameter [lambda]_(T) below 6.9 TeV are excluded. A combination with recent CMS diphoton results improves this exclusion to [lambda]_(T) below 7.7 TeV, providing the most sensitive limits to date in nonhadronic final states.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Beyond Standard Model
Hadron-Hadron scattering (experiments)
Megjelenés:Journal of High Energy Physics. - 2019 : 4 (2019), p. 1-36. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
Pályázati támogatás:NKFIA 123842
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5.

001-es BibID:BIBFORM119973
035-os BibID:(Scopus)85060754264 (WoS)000456584700001
Első szerző:CMS Collaboration
Cím:Search for supersymmetry in events with a photon, a lepton, and missing transverse momentum in proton-proton collisions at root{s}=13 TeV / CMS Collaboration
Dátum:2019
ISSN:1126-6708 1029-8479
Megjegyzések:Results of a search for supersymmetry are presented using events with a photon, an electron or muon, and large missing transverse momentum. The analysis is based on a data sample corresponding to an integrated luminosity of 35.9 fb(-1) of proton-proton collisions at 13 TeV, produced by the LHC and collected with the CMS detector in 2016. Theoretical models with gauge-mediated supersymmetry breaking predict events with photons in the final state, as well as electroweak gauge bosons decaying to leptons. Searches for events with a photon, a lepton, and missing transverse momentum are sensitive probes of these models. No excess of events is observed beyond expectations from standard model processes. The results of the search are interpreted in the context of simplified models inspired by gauge-mediated supersymmetry breaking. These models are used to derive upper limits on the production cross sections and set lower bounds on masses of supersymmetric particles. Gaugino masses below 930 GeV are excluded at the 95% confidence level in a simplified model with electroweak production of a neutralino and chargino. For simplified models of gluino and squark pair production, gluino masses up to 1.75 TeV and squark masses up to 1.43 TeV are excluded at the 95% confidence level.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
adron-Hadron scattering (experiments)
Supersymmetry
Megjelenés:Journal of High Energy Physics. - 2019 : 1 (2019), p. 1-39. -
További szerzők:Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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6.

001-es BibID:BIBFORM119967
035-os BibID:(Scopus)85061032987 (WoS)000456242900001
Első szerző:CMS Collaboration
Cím:Search for production of Higgs boson pairs in the four b quark final state using large-area jets in proton-proton collisions at root{s}=13 TeV / CMS Collaboration
Dátum:2019
ISSN:1126-6708 1029-8479
Megjegyzések:A search is presented for pair production of the standard model Higgs boson using data from proton-proton collisions at a centre-of-mass energy of 13 TeV, collected by the CMS experiment at the CERN LHC in 2016, and corresponding to an integrated luminosity of 35.9 fb(-1). The final state consists of two b quark-antiquark pairs. The search is conducted in the region of phase space where one pair is highly Lorentz-boosted and is reconstructed as a single large-area jet, and the other pair is resolved and is reconstructed using two b-tagged jets. The results are obtained by combining this analysis with another from CMS looking for events with two large jets. Limits are set on the product of the cross sections and branching fractions for narrow bulk gravitons and radions in warped extradimensional models having a mass in the range 750-3000 GeV. The resulting observed and expected upper limits on the non-resonant Higgs boson pair production cross section correspond to 179 and 114 times the standard model value, respectively, at 95% confidence level. The existence of anomalous Higgs boson couplings is also investigated and limits are set on the non-resonant Higgs boson pair production cross sections for representative coupling values.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Beyond Standard Model
Hadron-Hadron scattering (experiments)
Higgs physics
Jets
Megjelenés:Journal of High Energy Physics. - 2019 : 1 (2019), p. 1-25. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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7.

001-es BibID:BIBFORM119270
035-os BibID:(cikkazonosító)32 (WoS)000825333400006 (Scopus)85135977210
Első szerző:CMS Collaboration
Cím:Measurement of the inclusive and differential WZ production cross sections, polarization angles, and triple gauge couplings in pp collisions at root{s}=13 TeV / CMS Collaboration
Dátum:2022
ISSN:1126-6708 1029-8479
Megjegyzések:The associated production of a W and a Z boson is studied in final states with multiple leptons produced in proton-proton (pp) collisions at a centre-of-mass energy of 13 TeV using 137 fb(-1) of data collected with the CMS detector at the LHC. A measurement of the total inclusive production cross section yields sigma(tot)(pp -> WZ) = 50.6 +/- 0.8 (stat) +/- 1.5 (syst) +/- 1.1 (lumi) +/- 0.5 (theo) pb. Measurements of the fiducial and differential cross sections for several key observables are also performed in all the final-state lepton flavour and charge compositions with a total of three charged leptons, which can be electrons or muons. All results are compared with theoretical predictions computed up to next-to-next-to-leading order in quantum chromodynamics plus next-to-leading order in electroweak theory and for various sets of parton distribution functions. The results include direct measurements of the charge asymmetry and the W and Z vector boson polarization. The first observation of longitudinally polarized W bosons in WZ production is reported. Anomalous gauge couplings are searched for, leading to new constraints on beyond-the-standard-model contributions to the WZ triple gauge coupling.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Hadron-Hadron Scattering
Particle Correlations and Fluctuations
Megjelenés:Journal of High Energy Physics. - 2022 : 7 (2022), p. 1-77. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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8.

001-es BibID:BIBFORM119266
035-os BibID:(Scopus)85136307960 (WoS000826915800001)
Első szerző:CMS Collaboration
Cím:Search for long-lived heavy neutral leptons with displaced vertices in proton-proton collisions at root{s} = 13 TeV / CMS collaboration
Dátum:2022
ISSN:1126-6708 1029-8479
Megjegyzések:A search for heavy neutral leptons (HNLs), the right-handed Dirac or Majorana neutrinos, is performed in final states with three charged leptons (electrons or muons) using proton-proton collision data collected by the CMS experiment at root{s} = 13 TeV at the CERN LHC. The data correspond to an integrated luminosity of 138 fb^-1. The HNLs could be produced through mixing with standard model neutrinos [nu]. For small values of the HNL mass (<20 GeV) and the square of the HNL-[nu] mixing parameter (10^-7-10^-2), the decay length of these particles can be large enough so that the secondary vertex of the HNL decay can be resolved with the CMS silicon tracker. The selected final state consists of one lepton emerging from the primary proton-proton collision vertex, and two leptons forming a displaced, secondary vertex. No significant deviations from the standard model expectations are observed, and constraints are obtained on the HNL mass and coupling strength parameters, excluding previously unexplored regions of parameter space in the mass range 1-20 GeV and squared mixing parameter values as low as 10^-7.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Beyond Standard Model
Hadron-Hadron Scattering
Megjelenés:Journal of High Energy Physics. - 2022 : 7 (2022), p. 1-55. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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9.

001-es BibID:BIBFORM119255
035-os BibID:(Scopus)85135824884 (WoS)000838673900001
Első szerző:CMS Collaboration
Cím:Measurement of the Drell-Yan forward-backward asymmetry at high dilepton masses in proton-proton collisions at root{s} = 13 TeV / CMS collaboration
Dátum:2022
ISSN:1126-6708 1029-8479
Megjegyzések:A measurement of the forward-backward asymmetry of pairs of oppositely charged leptons (dimuons and dielectrons) produced by the Drell-Yan process in proton-proton collisions is presented. The data sample corresponds to an integrated luminosity of 138 fb(-1) collected with the CMS detector at the LHC at a center-of-mass energy of 13 TeV. The asymmetry is measured as a function of lepton pair mass for masses larger than 170 GeV and compared with standard model predictions. An inclusive measurement across both channels and the full mass range yields an asymmetry of 0.612 +/- 0.005 (stat) +/- 0.007 (syst). As a test of lepton flavor universality, the difference between the dimuon and dielectron asymmetries is measured as well. No statistically significant deviations from standard model predictions are observed. The measurements are used to set limits on the presence of additional gauge bosons. For a Z' boson in the sequential standard model the observed (expected) 95% confidence level lower limit on the Z' mass is 4.4 TeV (3.7 TeV).
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Hadron-Hadron Scattering
Lepton Production
Vector Boson Production
Megjelenés:Journal of High Energy Physics. - 2022 : 8 (2022), p. 1-57. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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10.

001-es BibID:BIBFORM119252
035-os BibID:(Scopus)85138201723 (WoS)000854758600001
Első szerző:CMS Collaboration
Cím:Search for a W' boson decaying to a vector-like quark and a top or bottom quark in the all-jets final state at root{s} = 13 TeV / CMS collaboration
Dátum:2022
ISSN:1126-6708 1029-8479
Megjegyzések:A search is presented for a heavy W· boson resonance decaying to a B or T vector-like quark and a t or a b quark, respectively. The analysis is performed using proton-proton collisions collected with the CMS detector at the LHC. The data correspond to an integrated luminosity of 138 fb(-1) at a center-of-mass energy of 13 TeV. Both decay channels result in a signature with a t quark, a Higgs or Z boson, and a b quark, each produced with a significant Lorentz boost. The all-hadronic decays of the Higgs or Z boson and of the t quark are selected using jet substructure techniques to reduce standard model backgrounds, resulting in a distinct three-jet W' boson decay signature. No significant deviation in data with respect to the standard model background prediction is observed. Upper limits are set at 95% confidence level on the product of the W' boson cross section and the final state branching fraction. A W' boson with a mass below 3.1 TeV is excluded, given the benchmark model assumption of democratic branching fractions. In addition, limits are set based on generalizations of these assumptions. These are the most sensitive limits to date for this final state.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Hadron-Hadron Scattering
Vector-Like Quarks
Vector Boson Production
Beyond Standard Model
Megjelenés:Journal of High Energy Physics. - 2022 : 9 (2022), p. 1-45. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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11.

001-es BibID:BIBFORM120354
035-os BibID:(Scopus)85169471808 (WoS)000762281700001
Első szerző:CMS Collaboration
Cím:Search for flavor-changing neutral current interactions of the top quark and the Higgs boson decaying to a bottom quark-antiquark pair at root{s}= 13 TeV / CMS Collaboration
Dátum:2022
ISSN:1126-6708 1029-8479
Megjegyzések:A search for flavor-changing neutral current interactions of the top quark (t) and the Higgs boson (H) is presented. The search is based on a data sample corresponding to an integrated luminosity of 137 fb(-1) recorded by the CMS experiment at the LHC in proton-proton collisions at root s = 13TeV. Events containing exactly one lepton (muon or electron) and at least three jets, among which at least two are identified as originating from the hadronization of a bottom quark, are analyzed. A set of deep neural networks is used for kinematic event reconstruction, while boosted decision trees distinguish the signal from the background events. No significant excess over the background predictions is observed, and upper limits on the signal production cross sections are extracted. These limits are interpreted in terms of top quark decay branching fractions (B) to the Higgs boson and an up (u) or a charm quark (c). Assuming one nonvanishing extra coupling at a time, the observed (expected) upper limits at 95% confidence level are B(t -> Hu) < 0.079 (0.11)% and B(t -> Hc) < 0.094 (0.086)%.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
B Physics
Flavour Changing Neutral Currents
Hadron-Hadron Scattering
Higgs Physics
Top Physics
Megjelenés:Journal of High Energy Physics. - 2022 : 2 (2022), p. 1-41. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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12.

001-es BibID:BIBFORM120321
035-os BibID:(Scopus)85058623941 (WoS)000453290200001
Első szerző:CMS Collaboration
Cím:Search for resonances in the mass spectrum of muon pairs produced in association with b quark jets in proton-proton collisions at root{s} = 8 and 13 TeV / CMS Collaboration
Dátum:2018
ISSN:1126-6708 1029-8479
Megjegyzések:A search for resonances in the mass range 12-70 GeV produced in association with a b quark jet and a second jet, and decaying to a muon pair, is reported. The analysis is based on data from proton-proton collisions at center-of-mass energies of 8 and 13 TeV, collected with the CMS detector at the LHC and corresponding to integrated luminosities of 19.7 and 35.9 fb(-1), respectively. The search is carried out in two mutually exclusive event categories. Events in the first category are required to have a b quark jet in the central region (|| 2.4) and at least one jet in the forward region (|| > 2.4). Events in the second category are required to have two jets in the central region, at least one of which is identified as a b quark jet, no jets in the forward region, and low missing transverse momentum. An excess of events above the background near a dimuon mass of 28 GeV is observed in the 8 TeV data, corresponding to local significances of 4.2 and 2.9 standard deviations for the first and second event categories, respectively. A similar analysis conducted with the 13 TeV data results in a mild excess over the background in the first event category corresponding to a local significance of 2.0 standard deviations, while the second category results in a 1.4 standard deviation deficit. The fiducial cross section measurements and 95% confidence level upper limits on those for a resonance consistent with the 8 TeV excess are provided at both collision energies.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Beyond Standard Model
Hadron-Hadron scattering (experiments)
Higgs physics
Megjelenés:Journal of High Energy Physics. - 2018 : 11 (2018), p. 1-37. -
További szerzők:Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
Pályázati támogatás:123842
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