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1.

001-es BibID:BIBFORM023417
035-os BibID:(WoS)000243973100004 (Scopus)36148976076
Első szerző:Abbiendi, G.
Cím:Search for invisibly decaying Higgs bosons with large decay width using the OPAL detector at LEP / G. Abbiendi on behalf of The OPAL Collaboration
Dátum:2007
ISSN:1434-6044
Megjegyzések:This paper describes a topological search for an invisibly decaying Higgs boson,H, produced via the Bjorken process (e+e- -> HZ). The analysis is based on data recorded using the OPAL detector at LEP at centre-of-mass energies from 183 to 209 GeV corresponding to a total integrated luminosity of 629pb-1. In the analysis only hadronic decays of the Z boson are considered. A scan over Higgs boson masses from 1 to 120 GeV and decay widths from 1 to 3000 GeV revealed no indication for a signal in the data. From a likelihood ratio of expected signal and Standard Model background we determine upper limits on cross-section times branching ratio to an invisible final state. For moderate Higgs boson decay widths, these range from about 0.07pb Mh = 60GeV) to 0.57pb (Mh = 114GeV). For decay widths above 200GeV the upper limits are of the order of 0.15pb. The results can be interpreted in general scenarios predicting a large invisible decay width of the Higgs boson. As an example we interpret the results in the so-called stealthy Higgs scenario. The limits from this analysis exclude a large part of the parameter range of this scenario experimentally accessible at LEP2.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:European Physical Journal C. - 49 : 2 (2007), p. 457-472. -
További szerzők:Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus) Dienes Beatrix (1972-) (élettanász, molekuláris biológus) The OPAL Collaboration
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2.

001-es BibID:BIBFORM023406
035-os BibID:(WoS)000250842100002 (Scopus)36148976076
Első szerző:Abbiendi, G.
Cím:Bose-Einstein study of position-momentum correlations of charged pions in hadronic Z0 decays / G. Abbiendi on behalf of The OPAL Collaboration
Dátum:2007
ISSN:1434-6044
Megjegyzések:A study of Bose-Einstein correlations in pairs of identically charged pions produced in e+e- annihilations at the Z0 peak has been performed for the first time assuming a non-static emitting source. The results are based on the high statistics data obtained with the OPAL detector at LEP. The correlation functions have been analyzed in intervals of the average pair transverse momentum and of the pair rapidity, in order to study possible correlations between the pion production points and their momenta (position-momentum correlations). The Yano-Koonin and the Bertsch-Pratt parameterizations have been fitted to the measured correlation functions to estimate the geometrical parameters of the source as well as the velocity of the source elements with respect to the overall centre-of-mass frame. The source rapidity is found to scale approximately with the pair rapidity, and both the longitudinal and transverse source dimensions are found to decrease for increasing average pair transverse momenta.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:European Physical Journal C. - 52 : 4 (2007), p. 787-803. -
További szerzők:Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus) Dienes Beatrix (1972-) (élettanász, molekuláris biológus) The OPAL Collaboration
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3.

001-es BibID:BIBFORM023399
035-os BibID:(WoS)000250842100001 (Scopus)36148983425
Első szerző:Abbiendi, G.
Cím:Measurement of the e+e->W+W- cross section and W decay branching fractions at LEP / G. Abbiendi on behalf of The OPAL Collaboration
Dátum:2007
ISSN:1434-6044
Megjegyzések:From a total data sample of 701.1 pb^-1 recorded with e+e- centre-of-mass energies of sqrt = 161-209 GeV with the OPAL detector at LEP, 11693 W-pair candidate events are selected. These data are used to obtain measurements of the W-pair production cross sections at 10 different centre-of-mass energies. The ratio of the measured cross sections to the Standard Model expectation is found to be: data/SM = 1.002 +- 0.011(stat.) +- 0.007(syst.) +- 0.005(theory), where the uncertainties are statistical, experimental systematics and theory systematics respectively. The data are used to determine the W boson branching fractions, which are found to be consistent with lepton universality of the charged current interaction. Assuming lepton universality, the branching ratio to hadrons is determined to be 67.41 +- 0.37(stat.) +- 0.23(syst.)%, from which the CKM matrix element Vcs is determined to be 0.96+-0.017(stat.)+-0.012(syst.).The differential cross section as a function of the W^- production angle is measured for the qqev and qqmv final states. The results described in this paper are consistent with the expectations from the Standard Model.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:European Physical Journal C. - 52 : 4 (2007), p. 767-785. -
További szerzők:Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus) Dienes Beatrix (1972-) (élettanász, molekuláris biológus) The OPAL Collaboration
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4.

001-es BibID:BIBFORM005834
035-os BibID:(WoS)000251382800003 (Scopus)36749015100
Első szerző:Abbiendi, G.
Cím:Measurement of αs with radiative hadronic events / G. Abbiendi on behalf of The OPAL Collaboration
Dátum:2008
Megjegyzések:Hadronic final states with a hard isolated photon are studied using data taken at centre-of-mass energies around the mass of the Z boson with the OPAL detector at LEP. The strong coupling ?s is extracted by comparing data and QCD predictions for event shape observables at average reduced centre-of-mass energies ranging from 24 GeV to 78 GeV, and the energy dependence of ?s is studied. Our results are consistent with the running of ?s as predicted by QCD and show that within the uncertainties of our analysis event shapes in hadronic Z decays with hard and isolated photon radiation can be described by QCD at reduced centre-of-mass energies. Combining all values from different event shape observables and energies gives ?s(MZ)=0.1182?0.0015(stat.)?0.0101(syst.).
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
OPAL kísérlet
Megjelenés:The European Physical Journal C. - 53 (2008), p. 21-39. -
További szerzők:Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus) Dienes Beatrix (1972-) (élettanász, molekuláris biológus) The OPAL Collaboration
Internet cím:elektronikus változat
DOI
elektronikus változat
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5.

001-es BibID:BIBFORM119083
035-os BibID:(Scopus)85065028824 (WOS)000466407200001
Első szerző:CMS Collaboration
Cím:Measurement of the t[overline]t production cross section, the top quark mass, and the strong coupling constant using dilepton events in pp collisions at root{s} = 13 TeV / CMS Collaboration
Dátum:2019
ISSN:1434-6044
Megjegyzések:A measurement of the top quark-antiquark pair production cross section sigma(t (t) over bar) in proton-proton collisions at a centre-of-mass energy of 13 TeV is presented. The data correspond to an integrated luminosity of 35.9 fb(-1), recorded by the CMS experiment at the CERN LHC in 2016. Dilepton events (e(+/-) mu(-/+), mu(+) mu(-), e(+) e(-)) are selected and the cross section is measured from a likelihood fit. For a top quark mass parameter in the simulation of m(t)(MC) = 172.5 GeV the fit yields a measured cross section sigma(t (t) over bar) = 803 +/- 2 (stat) +/- 25 (syst) +/- 20 (lumi) pb, in agreement with the expectation from the standard model calculation at next-to-next-to-leading order. A simultaneous fit of the cross section and the top quark mass parameter in the POWHEG simulation is performed. The measured value of m(t)(MC) = 172.33 +/- 0.14 (stat)(-0.72)(+0.66) (syst) GeV is in good agreement with previous measurements. The resulting cross section is used, together with the theoretical prediction, to determine the top quark mass and to extract a value of the strong coupling constant with different sets of parton distribution functions.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
DISTRIBUTIONS
Megjelenés:European Physical Journal C. - 79 : 5 (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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6.

001-es BibID:BIBFORM119968
035-os BibID:(Scopus)85060913403 (WoS)000455524300001
Első szerző:CMS Collaboration
Cím:Measurement of differential cross sections for inclusive isolated-photon and photon plus jet production in proton-proton collisions at root{s}=13 TeV / CMS Collaboration
Dátum:2019
ISSN:1434-6044
Megjegyzések:Measurements of inclusive isolated-photon and photon+jet production in proton-proton collisions at =13TeV are presented. The analysis uses data collected by the CMS experiment in 2015, corresponding to an integrated luminosity of 2.26fb-1. The cross section for inclusive isolated photon production is measured as a function of the photon transverse energy in a fiducial region. The cross section for photon+jet production is measured as a function of the photon transverse energy in the same fiducial region with identical photon requirements and with the highest transverse momentum jet. All measurements are in agreement with predictions from next-to-leading-order perturbative QCD.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
PP COLLISIONS
GLUON DISTRIBUTION
TEV
CONSTRAINTS
Megjelenés:European Physical Journal C. - 79 : 1 (2019), p. 1-28. -
További szerzők:Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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7.

001-es BibID:BIBFORM119941
035-os BibID:(Scopus)85072183946 (WoS)000466094100001
Első szerző:CMS Collaboration
Cím:Search for vector-like quarks in events with two oppositely charged leptons and jets in proton-proton collisions at root s=13TeV / CMS Collaboration
Dátum:2019
ISSN:1434-6044
Megjegyzések:A search for the pair production of heavy vector-like partners T and B of the top and bottom quarks has been performed by the CMS experiment at the CERN LHC using proton-proton collisions at . The data sample was collected in 2016 and corresponds to an integrated luminosity of 35.9 production include those where one of the T quarks decays via TtZ and the other via TbW, tZ, or tH, where H is a Higgs boson. For the BB case, final states include those where one of the B quarks decays via BbZ and the other BtW, bZ, or bH. Events with two oppositely charged electrons or muons, consistent with coming from the decay of a Z boson, and jets are investigated. The number of observed events is consistent with standard model background estimations. Lower limits at 95% confidence level are placed on the masses of the T and B quarks for a range of branching fractions. Assuming 100% branching fractions for TtZ, and BbZ, T and B quark mass values below 1280 and 1130 respectively, are excluded.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
PHYSICS
Megjelenés:European Physical Journal C. - 79 : 4 (2019), p. 1-31. -
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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8.

001-es BibID:BIBFORM120967
035-os BibID:(cikkazonosító)667 (WoS)001062453500002 (Scopus)85168638397
Első szerző:CMS Collaboration
Cím:Measurements of the Higgs boson production cross section and couplings in the W boson pair decay channel in proton-proton collisions at root{s}=13 TeV / CMS Collaboration
Dátum:2023
ISSN:1434-6052
Megjegyzések:Production cross sections of the standard model Higgs boson decaying to a pair of W bosons are measured in proton-proton collisions at a center-of-mass energy of 13 TeV. The analysis targets Higgs bosons produced via gluon fusion, vector boson fusion, and in association with a W or Z boson. Candidate events are required to have at least two charged leptons and moderate missing transverse momentum, targeting events with at least one leptonically decaying W boson originating from the Higgs boson. Results are presented in the form of inclusive and differential cross sections in the simplified template cross section framework, as well as couplings of the Higgs boson to vector bosons and fermions. The data set collected by the CMS detector during 2016-2018 is used, corresponding to an integrated luminosity of 138 fb(-1). The signal strength modifier mu, defined as the ratio of the observed production rate in a given decay channel to the standard model expectation, is measured to be mu = 0.95(-0.09)(+0.10). All results are found to be compatible with the standard model within the uncertainties.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:The European Physical Journal C. - 83 : 7 (2023), p. 1-52. -
További szerzők:Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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9.

001-es BibID:BIBFORM120359
035-os BibID:(Scopus)85127289934 (WoS)000757436200002
Első szerző:CMS Collaboration
Cím:Search for long-lived particles decaying to leptons with large impact parameter in proton-proton collisions at root{s}=13TeV / CMS Collaboration
Dátum:2022
ISSN:1434-6044
Megjegyzések:A search for new long-lived particles decaying to leptons using proton-proton collision data produced by the CERN LHC at root s = 13 TeV is presented. Events are selected with two leptons (an electron and a muon, two electrons, or two muons) that both have transverse impact parameter values between 0.01 and 10 cm and are not required to form a common vertex. Data used for the analysis were collected with the CMS detector in 2016, 2017, and 2018, and correspond to an integrated luminosity of 118 (113) fb(-1) in the ee channel (e mu and mu mu channels). The search is designed to be sensitive to a wide range of models with displaced e mu ee, and mu mu final states. The results constrain several well-motivated models involving new long-lived particles that decay to displaced leptons. For some areas of the available phase space, these are the most stringent constraints to date.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:European Physical Journal C. - 82 : 2 (2022), p. 1-32. -
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:BIBFORM119884
035-os BibID:(Scopus)85061186683 (WoS)000458194400003
Első szerző:CMS Collaboration
Cím:Study of the underlying event in top quark pair production in pp collisions at 13 TeV / CMS Collaboration
Dátum:2019
ISSN:1434-6044
Megjegyzések:Measurements of normalized differential cross sections as functions of the multiplicity and kinematic variables of charged-particle tracks from the underlying event in top quark and antiquark pair production are presented. The measurements are performed in proton-proton collisions at a center-of-mass energy of 13 TeV, and are based on data collected by the CMS experiment at the LHC in 2016 corresponding to an integrated luminosity of 35.9fb(-1). Events containing one electron, one muon, and two jets from the hadronization and fragmentation of b quarks are used. These measurements characterize, for the first time, properties of the underlying event in top quark pair production and show no deviation from the universality hypothesis at energy scales typically above twice the top quark mass.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
PLUS PLUS
W+W
Megjelenés:European Physical Journal C. - 79 : 2 (2019), p. 1-49. -
További szerzők:Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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11.

001-es BibID:BIBFORM119081
035-os BibID:(Scopus)85065489028 (WOS)000467693600001
Első szerző:CMS Collaboration
Cím:Measurement of the energy density as a function of pseudorapidity in proton-proton collisions at root{s} = 13 TeV / CMS Collaboration
Dátum:2019
ISSN:1434-6044
Megjegyzések:A measurement of the energy density in proton-proton collisions at a centre-of-mass energy of sTeV is presented. The data have been recorded with the CMS experiment at the LHC during low luminosity operations in 2015. The energy density is studied as a function of pseudorapidity in the ranges -6.6<[nu]<-5.2 and 3.15<|[nu]|<5.20. The results are compared with the predictions of several models. All the models considered suggest a different shape of the pseudorapidity dependence compared to that observed in the data. A comparison with LHC proton-proton collision data at root{s}=0.9 and 7 TeV confirms the compatibility of the data with the hypothesis of limiting fragmentation.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
INELASTIC EP SCATTERING
LHC
ANNIHILATION
MODEL
Megjelenés:European Physical Journal C. - 79 : 5 (2019), p. 1-24. -
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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12.

001-es BibID:BIBFORM119075
035-os BibID:(Scopus)85066045697 (WOS)000468511900008
Első szerző:CMS Collaboration
Cím:Combined measurements of Higgs boson couplings in proton-proton collisions at root{s} = 13 TeV / CMS Collaboration
Dátum:2019
ISSN:1434-6044
Megjegyzések:Combined measurements of the production and decay rates of the Higgs boson, as well as its couplings to vector bosons and fermions, are presented. The analysis uses the LHC proton-proton collision data set recorded with the CMS detector in 2016 at fb-1. The combination is based on analyses targeting the five main Higgs boson production mechanisms (gluon fusion, vector boson fusion, and associated production with a W or Z boson, or a top quark-antiquark pair) and the following decay modes: H, ZZ, WW, , bb, and . Searches for invisible Higgs boson decays are also considered. The best-fit ratio of the signal yield to the standard model expectation is measured to be =1.17 +/- 0.10, assuming a Higgs boson mass of 125.09. Additional results are given for various assumptions on the scaling behavior of the production and decay modes, including generic parametrizations based on ratios of cross sections and branching fractions or couplings. The results are compatible with the standard model predictions in all parametrizations considered. In addition, constraints are placed on various two Higgs doublet models.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
ELECTROWEAK SYMMETRY-BREAKING
BROKEN SYMMETRIES
QCD CORRECTIONS
STANDARD MODEL
SUPERSYMMETRY
RENORMALIZATION
HIERARCHY
PARTICLES
SEARCH
DECAYS
Megjelenés:European Physical Journal C. - 79 : 5 (2019), p. 1-44. -
További szerzők:Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
Pályázati támogatás:NKFIA 123842
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