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1.

001-es BibID:BIBFORM124008
035-os BibID:(Scopus)84934299166 (WoS)000357123400006
Első szerző:CMS Collaboration
Cím:Distributions of topological observables in inclusive three- and four-jet events in pp collisions at root{s} = 7 TeV / CMS Collaboration
Dátum:2015
ISSN:1434-6044
Megjegyzések:This paper presents distributions of topological observables in inclusive three- and four-jet events produced in pp collisions at a centre-of-mass energy of 7 TeV with a data sample collected by the CMS experiment corresponding to a luminosity of 5.1 fb(-1). The distributions are corrected for detector effects, and compared with several event generators based on two- and multi-parton matrix elements at leading order. Among the considered calculations, MadGraph interfaced with PYTHIA6 displays the overall best agreement with data.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
A-center
Center-of-mass energies
Centre-of-mass energies
Data sample
Detector effects
Event generators
Leading orders
Matrix elements
Megjelenés:European Physical Journal C. - 75 : 7 (2015), p. 1-26. -
További szerzők:Karancsi János (1987-) (fizikus) Makovec Alajos (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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2.

001-es BibID:BIBFORM123975
035-os BibID:(Scopus)84946548624 (WoS)000379515400002
Első szerző:CMS Collaboration
Cím:Measurements of the ZZ production cross sections in the 2l2[nü] channel in proton-proton collisions at root{s} = 7 and 8 TeV and combined constraints on triple gauge couplings / CMS Collaboration
Dátum:2015
ISSN:1434-6044
Megjegyzések:Measurements of the ZZ production cross sections in proton-proton collisions at center-of-mass energies of 7 and 8 TeV are presented. Candidate events for the leptonic decay mode ZZ -> 2l2 nu. where l denotes an electron or a muon, are reconstructed and selected from data corresponding to an integrated luminosity of 5.1 (19.6) fb(-1) at 7 (8) TeV collected with the CMS experiment. The measured cross sections, sigma(pp -> ZZ) = 5.1(1.4)(+1.5) (stat)(-1.1)(+1.4) (syst) +/- 0.1 (lumi) pb at 7 TeV, and 7.2(-0.8)(+0.8) (stat)(1.5)(+1.9) (syst) +/- 0.2 (lumi) pb at 8 TeV, are in good agreement with the standard model predictions with next-to-leading-order accuracy. The selected data are analyzed to search for anomalous triple gauge couplings involving the ZZ final state. In the absence of any deviation from the standard model predictions, limits are set on the relevant parameters. These limits are then combined with the previously published CMS results for ZZ in 4l final states, yielding the most stringent constraints on the anomalous couplings.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Center-of-mass energies
Centre-of-mass energies
Combined constraints
Final state
Gauge couplings
Measurements of
Model prediction
Production cross section
Proton proton collisions
The standard model
Megjelenés:European Physical Journal C. - 75 : 10 (2015), p. 1-26. -
További szerzők:Karancsi János (1987-) (fizikus) Makovec Alajos (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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3.

001-es BibID:BIBFORM123971
035-os BibID:(Scopus)84922439965 (WoS)000354544800003
Első szerző:CMS Collaboration
Cím:Measurement of electroweak production of two jets in association with a Z boson in proton-proton collisions at root{s} = 8 TeV / CMS Collaboration
Dátum:2015
ISSN:1434-6044
Megjegyzések:The purely electroweak (EW) cross section for the production of two jets in association with a Z boson, in proton-proton collisions at root s = 8 TeV, is measured using data recorded by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 19.7 fb(-1). The electroweak cross section for the lljj final state (with l = e or mu and j representing the quarks produced in the hard interaction) in the kinematic region defined by M-ll > 50 GeV, M-jj > 120 GeV, transverse momentum p(Tj) > 25 GeV, and pseudorapidity vertical bar eta(j)vertical bar < 5, is found to be sigma(EW) (lljj) = 174 +/- 15 (stat) +/- 40 (syst) fb, in agreement with the standard model prediction. The associated jet activity of the selected events is studied, in particular in a signal-enriched region of phase space, and the measurements are found to be in agreement with QCD predictions.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:European Physical Journal C. - 75 : 2 (2015), p. 1-35. -
További szerzők:Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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4.

001-es BibID:BIBFORM124120
035-os BibID:(Scopus)84891147005 (WoS)000326386200001
Első szerző:CMS Collaboration
Cím:Measurement of the W+W- cross section in pp collisions at root{s} = 7 TeV and limits on anomalous WW[gamma] and WWZ couplings / The CMS Collaboration
Dátum:2013
ISSN:1434-6044
Megjegyzések:A measurement of W+W- production in pp collisions at is presented. The data were collected with the CMS detector at the LHC, and correspond to an integrated luminosity of 4.92 +/- 0.11 fb(-1). The W+W- candidates consist of two oppositely charged leptons, electrons or muons, accompanied by large missing transverse energy. The W+W- production cross section is measured to be 52.4 +/- 2.0 (stat.)+/- 4.5 (syst.)+/- 1.2 (lum.) pb. This measurement is consistent with the standard model prediction of 47.0 +/- 2.0 pb at next-to-leading order. Stringent limits on the WW gamma and WWZ anomalous triple gauge-boson couplings are set.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Charged leptons
CMS detectors
Integrated luminosity
Measurements of
Model prediction
Next-to-leading orders
Production cross section
The standard model
Transverse energy
WWZ couplings
Megjelenés:European Physical Journal C. - 73 : 10 (2013), p. 1-22. -
További szerzők:Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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5.

001-es BibID:BIBFORM124116
035-os BibID:(Scopus)84892434493 (WoS)000328899100001
Első szerző:CMS Collaboration
Cím:Search for top-squark pair production in the single-lepton final state in pp collisions at root{s} = 8 TeV / The CMS Collaboration
Dátum:2013
ISSN:1434-6044
Megjegyzések:This paper presents a search for the pair production of top squarks in events with a single isolated electron or muon, jets, large missing transverse momentum, and large transverse mass. The data sample corresponds to an integrated luminosity of 19.5 fb(-1) of pp collisions collected in 2012 by the CMS experiment at the LHC at a center-of-mass energy of . No significant excess in data is observed above the expectation from standard model processes. The results are interpreted in the context of supersymmetric models with pair production of top squarks that decay either to a top quark and a neutralino or to a bottom quark and a chargino. For small mass values of the lightest supersymmetric particle, top-squark mass values up to around 650 GeV are excluded.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:European Physical Journal C. - 73 : 12 (2013), p. 1-46. -
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:BIBFORM124115
035-os BibID:(Scopus)84881612066 (WoS)000322575300019
Első szerző:CMS Collaboration
Cím:Measurement of masses in the tt system by kinematic endpoints in pp collisions at root{s} = 7 TeV / The CMS Collaboration
Dátum:2013
ISSN:1434-6044
Megjegyzések:A simultaneous measurement of the top-quark, W-boson, and neutrino masses is reported for t (t) over bar events selected in the dilepton final state from a data sample corresponding to an integrated luminosity of 5.0 fb(-1) collected by the CMS experiment in pp collisions at root s = 7 TeV. The analysis is based on endpoint determinations in kinematic distributions. When the neutrino and W-boson masses are constrained to their world-average values, a top-quark mass value of M-t = 173.9 +/- 0.9 (stat.)=(+ 1.7)(-2.1) (syst.) GeV is obtained. When such constraints are not used, the three particle masses are obtained in a simultaneous fit. In this unconstrained mode the study serves as a test of mass determination methods that may be used in beyond standard model physics scenarios where several masses in a decay chain may be unknown and undetected particles lead to underconstrained kinematics.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Average values
Data sample
Dileptons
Final state
Integrated luminosity
Measurements of
Neutrino mass
Simultaneous measurement
Top quarks
W bosons
Megjelenés:European Physical Journal C. - 73 : 7 (2013), 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:BIBFORM124098
035-os BibID:(Scopus)84878813421 (WoS)000321855400023
Első szerző:CMS Collaboration
Cím:Search for a standard-model-like Higgs boson with a mass in the range 145 to 1000 GeV at the LHC / The CMS Collaboration
Dátum:2013
ISSN:1434-6044
Megjegyzések:A search for a standard-model-like Higgs boson in the H -> WW and H -> ZZ decay channels is reported, for Higgs boson masses in the range 145 < m(H) < 1000 GeV. The search is based upon proton-proton collision data samples corresponding to an integrated luminosity of up to 5.1 fb(-1) at root s = 7 TeV and up to 5.3 fb(-1) at root s = 8 TeV, recorded by the CMS experiment at the LHC. The combined upper limits at 95 % confidence level on products of the cross section and branching fractions exclude a standard-model-like Higgs boson in the range 145 < m(H) < 710 GeV, thus extending the mass region excluded by CMS from 127-600 GeV up to 710 GeV.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Branching fractions
Confidence levels
Data sample
Decay channels
Higgs boson
Integrated luminosity
Mass regions
Proton proton collisions
Standard model
Upper limits
Megjelenés:European Physical Journal C. - 73 : 6 (2013), p. 1-27. -
További szerzők:Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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8.

001-es BibID:BIBFORM124065
035-os BibID:(Scopus)84889245193 (WoS)000328342400001
Első szerző:CMS Collaboration
Cím:Jet and underlying event properties as a function of charged-particle multiplicity in proton-proton collisions at root{s} = 7 TeV / The CMS Collaboration
Dátum:2013
ISSN:1434-6044
Megjegyzések:Characteristics of multi-particle production in proton-proton collisions at root s = 7 TeV are studied as a function of the charged-particle multiplicity, N (ch). The produced particles are separated into two classes: those belonging to jets and those belonging to the underlying event. Charged particles are measured with pseudorapidity |eta|< 2.4 and transverse momentum p (T)> 0.25 GeV/c. Jets are reconstructed from charged-particles only and required to have p (T)> 5 GeV/c. The distributions of jet p (T), average p (T) of charged particles belonging to the underlying event or to jets, jet rates, and jet shapes are presented as functions of N (ch) and compared to the predictions of the pythia and herwig event generators. Predictions without multi-parton interactions fail completely to describe the N (ch)-dependence observed in the data. For increasing N (ch), pythia systematically predicts higher jet rates and harder p (T) spectra than seen in the data, whereas herwig shows the opposite trends. At the highest multiplicity, the data-model agreement is worse for most observables, indicating the need for further tuning and/or new model ingredients.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:European Physical Journal C. - 73 : 12 (2013), p. 1-26. -
További szerzők:Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
Internet cím:DOI
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9.

001-es BibID:BIBFORM124050
035-os BibID:(Scopus)84883824987 (WoS)000324827400001
Első szerző:CMS Collaboration
Cím:Search for supersymmetry in hadronic final states with missing transverse energy using the variables [alfa]T and b-quark multiplicity in pp collisions at root{s} = 8 TeV / The CMS Collaboration
Dátum:2013
ISSN:1434-6044
Megjegyzések:An inclusive search for supersymmetric processes that produce final states with jets and missing transverse energy is performed in pp collisions at a centre-of-mass energy of 8 TeV. The data sample corresponds to an integrated luminosity of 11.7 fb(-1) collected by the CMS experiment at the LHC. In this search, a dimensionless kinematic variable, alpha(T), is used to discriminate between events with genuine and misreconstructed missing transverse energy. The search is based on an examination of the number of reconstructed jets per event, the scalar sum of transverse energies of these jets, and the number of these jets identified as originating from bottom quarks. No significant excess of events over the standard model expectation is found. Exclusion limits are set in the parameter space of simplified models, with a special emphasis on both compressed-spectrum scenarios and direct or gluino-induced production of third-generation squarks. For the case of gluino-mediated squark production, gluino masses up to 950-1125 GeV are excluded depending on the assumed model. For the direct pair-production of squarks, masses up to 450 GeV are excluded for a single light first-or second-generation squark, increasing to 600 GeV for bottom squarks.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
A-center
Center-of-mass energies
Centre-of-mass energies
Data sample
Final state
Gluinos
Hadronics
Squarks
Supersymmetries
Transverse energy
Megjelenés:European Physical Journal C. - 73 : 9 (2013), p. 1-31. -
További szerzők:Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
Internet cím:DOI
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10.

001-es BibID:BIBFORM124048
035-os BibID:(Scopus)84876433344 (WoS)000318290600012
Első szerző:CMS Collaboration
Cím:Measurement of differential top-quark-pair production cross sections in pp collisions at root{s} = 7 TeV / The CMS Collaboration
Dátum:2013
ISSN:1434-6044
Megjegyzések:Normalised differential top-quark-pair production cross sections are measured in pp collisions at a centre-of-mass energy of 7 TeV at the LHC with the CMS detector using data recorded in 2011 corresponding to an integrated luminosity of 5.0 fb(-1). The measurements are performed in the lepton + jets decay channels (e + jets and mu + jets) and the dilepton decay channels (e(+)e(-), mu(+)mu(-), and mu(+/-)e(-/+)). The t (t) over bar differential cross section is measured as a function of kinematic properties of the final-state charged leptons and jets associated to b quarks, as well as those of the top quarks and the t (t) over bar system. The data are compared with several predictions from perturbative QCD calculations up to approximate next-to-next-to-leading-order precision. No significant deviations from the standard model are observed.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
A-center
Center-of-mass energies
Centre-of-mass energies
CMS detectors
Decay channels
Integrated luminosity
Measurements of
Pair production
Production cross section
Top quarks
Megjelenés:European Physical Journal C. - 73 : 3 (2013), p. 1-29. -
További szerzők:Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
Internet cím:DOI
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11.

001-es BibID:BIBFORM124205
035-os BibID:(Scopus)84878985546 (WoS)000319518900001
Első szerző:CMS Collaboration
Cím:Search for supersymmetry in pp collisions at root{s} = 7 TeV in events with a single lepton, jets, and missing transverse momentum / The CMS Collaboration
Dátum:2013
ISSN:1434-6044
Megjegyzések:Results are reported from a search for new physics processes in events containing a single isolated high-transverse-momentum lepton (electron or muon), energetic jets, and large missing transverse momentum. The analysis is based on a 4.98 fb(-1) sample of proton-proton collisions at a center-of-mass energy of 7 TeV, obtained with the CMS detector at the LHC. Three separate background estimation methods, each relying primarily on control samples in the data, are applied to a range of signal regions, providing complementary approaches for estimating the background yields. The observed yields are consistent with the predicted standard model backgrounds. The results are interpreted in terms of limits on the parameter space for the constrained minimal supersymmetric extension of the standard model, as well as on cross sections for simplified models, which provide a generic description of the production and decay of new particles in specific, topology based final states.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:European Physical Journal C. - 73 : 5 (2013), p. 1-41. -
További szerzők:Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
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12.

001-es BibID:BIBFORM130574
Első szerző:CMS Collaboration
Cím:Reweighting simulated events using machine-learning techniques in the CMS experiment / CMS Collaboration
Dátum:2025
ISSN:1434-6052
Megjegyzések:Data analyses in particle physics rely on an accurate simulation of particle collisions and a detailed simulation of detector effects to extract physics knowledge from the recorded data. Event generators together with a geantbased simulation of the detectors are used to produce large samples of simulated events for analysis by the LHC experiments. These simulations come at a high computational cost, where the detector simulation and reconstruction algorithms have the largest CPU demands. This article describes how machine-learning (ML) techniques are used to reweight simulated samples obtained with a given set of parameters to samples with different parameters or samples obtained from entirely different simulation programs. The ML reweighting method avoids the need for simulating the detector response multiple times by incorporating the relevant information in a single sample through event weights. Results are presented for reweighting to model variations and higher-order calculations in simulated top quark pair production at the LHC. This ML-based reweighting is an important element of the future computing model of the CMS experiment and will facilitate precision measurements at the High-Luminosity LHC.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:The European Physical Journal C. - 85 : 5 (2025), p. 1-35. -
További szerzők:Ujvári Balázs (1977-) (fizikus) Oláh László (1967-) (fizikus)
Internet cím:DOI
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