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001-es BibID:BIBFORM119343
035-os BibID:(Scopus)85065215476 (WOS)000464740700003
Első szerző:Aidala, C. A.
Cím:Measurements of [mu][mu] pairs from open heavy flavor and Drell-Yan in p + p collisions at root{s} = 200 GeV / C. Aidala, PHENIX Collaboration
Dátum:2019
ISSN:2470-0010 2470-0029
Megjegyzések:PHENIX reports differential cross sections of mu mu pairs from semileptonic heavy-flavor decays and the Drell-Yan production mechanism measured in p + p collisions at root s = 200 GeV at forward and backward rapidity (1.2 < vertical bar eta vertical bar < 2.2). The mu mu pairs from c (c) over bar, b (b) over bar, and Drell-Yan are separated using a template fit to unlike- and like-sign muon pair spectra in mass and p(T). The azimuthal opening angle correlation between the muons from c (c ) over bar and b (b) over bar decays and the pair-p(T) distributions are compared to distributions generated using PYTHIA and POWHEG models, which both include next-to-leading order processes. The measured distributions for pairs from a are consistent with PYTHIA calculations. The c (c) over bar data present narrower azimuthal correlations and softer p(T) distributions compared to distributions generated from POWHEG. The b (b ) over bar data are well described by both models. The extrapolated total cross section for bottom production is 3.75 +/- 0.24(stat) +/-(0.35)(0.50) (syst) +/- 0.45(global) [mu b], which is consistent with previous measurements at the Relativistic Heavy Ion Collider in the same system at the same collision energy and is approximately a factor of 2 higher than the central value calculated with theoretical models. The measured Drell-Yan cross section is in good agreement with next-to-leading-order quantum-chromodynamics calculations.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
PRODUCTION CROSS-SECTION
MESON PRODUCTION
P(P)OVER-BAR COLLISIONS
BEAUTY PRODUCTION
QUARK PRODUCTION
ROOT-S
TEV
DECAYS
Megjelenés:Physical Review D. - 99 : 7 (2019), p. 1-41. -
További szerzők:Lovász K. (fizikus) Majoros Tamás (1991-) (mérnök, informatikus) Sun, Zhiyu Tarnai G. Ujvári Balázs (1977-) (fizikus) PHENIX Collaboration
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2.

001-es BibID:BIBFORM119070
035-os BibID:(Scopus)85066955176 (WOS)000467735200003
Első szerző:Aidala, C. A.
Cím:Measurement of charm and bottom production from semileptonic hadron decays in p + p collisions at root{s} = 200 GeV / C. Aidala, PHENIX Collaboration
Dátum:2019
ISSN:2470-0010 2470-0029
Megjegyzések:Measurements of the differential production of electrons from open-heavy-flavor hadrons with charm-and bottom-quark content in p + p collisions at root s = 200 GeV are presented. The measurements proceed through displaced-vertex analyses of electron tracks from the semileptonic decay of charm and bottom hadrons using the PHENIX silicon-vertex detector. The relative contribution of electrons from bottom decays to inclusive heavy-flavor-electron production is found to be consistent with fixed-order-plus-next-to-leading-log perturbative-QCD calculations within experimental and theoretical uncertainties. These new measurements in p + p collisions provide a precision baseline for comparable forthcoming measurements in A + A collisions.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
LARGE TRANSVERSE-MOMENTUM
ROOT-S(NN)=200 GEV
AU COLLISIONS
Megjelenés:Physical Review D. - 99 : 9 (2019), p. 1-21. -
További szerzők:Dávid Gábor (fizikus) Lovász K. (fizikus) Majoros Tamás (1991-) (mérnök, informatikus) Sun, Zhiyu Tarnai G. Ujvári Balázs (1977-) (fizikus) PHENIX Collaboration
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3.

001-es BibID:BIBFORM118949
035-os BibID:(Scopus)85069921283 (WOS)000474895000007
Első szerző:PHENIX Collaboration
Cím:Beam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions / PHENIX Collaboration
Dátum:2019
ISSN:0031-9007
Megjegyzések:The PHENIX collaboration presents first measurements of low-momentum (0.4 < p(T) < 3 GeV/c) direct-photon yields from Au + Au collisions at root s(NN) =39 and 62.4 GeV. For both beam energies the direct-photon yields are substantially enhanced with respect to expectations from prompt processes, similar to the yields observed in Au +horn Au collisions at root s(NN) =200. Analyzing the photon yield as a function of the experimental observable dN(ch)/d(eta) eveals that the low-momentum (> 1 GeV= c) direct-photon yield dN(gamma)(dir)/d(eta) is a smooth function f dN(ch)/d eta and can be well described as proportional to (dN(ch)/d(eta))(alpha) with a approximate to 1.25. This scaling behavior holds for a wide range of beam energies at the Relativistic Heavy Ion Collider and the Large Hadron Collider, for centrality selected samples, as well as for different A thorn A collision systems. At a given beam energy, the scaling also holds for high p(T) (> 5 GeV= c), but when results from different collision energies are compared, an additional root s(NN) -dependent multiplicative factor is needed to describe the integrated-direct-photon yield.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
DILEPTONS
Megjelenés:Physical Review Letters. - 123 : 2 (2019), p. 1-10. -
További szerzők:Imrek József (1980-) Majoros Tamás (1991-) (mérnök, informatikus) Sun, Zhiyu Tarján Péter (fizikus) Ujvári Balázs (1977-) (fizikus) Vértesi Róbert
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4.

001-es BibID:BIBFORM116658
035-os BibID:(cikkazonosító)112004 (Scopus)85163488281 (WoS)001023912700006
Első szerző:PHENIX Collaboration
Cím:Transverse single-spin asymmetry of midrapidity [tau]^0 and [eta] mesons in p+Au and p+Al collisions at root{s_NN}=200 GeV / PHENIX Collaboration
Dátum:2023
ISSN:2470-0010 2470-0029
Megjegyzések:Presented are the first measurements of the transverse single-spin asymmetries (A_N) for neutral pions and eta mesons in p + Au and p + Al collisions at root{s_NN}=200 GeV in the pseudorapidity range |[eta]| < 0.35 with the PHENIX detector at the Relativistic Heavy Ion Collider. The asymmetries are consistent with zero, similar to those for midrapidity neutral pions and eta mesons produced in p + p collisions. These measurements show no evidence of additional effects that could potentially arise from the more complex partonic environment present in proton-nucleus collisions.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Physical Review D. - 107 : 11 (2023), p. 1-9. -
További szerzők:Abdulameer, Nour Jalal Firak, Daniel Scheres Lovász K. (fizikus) Majoros Tamás (1991-) (mérnök, informatikus) Orosz M. Sun, Zhiyu Tarnai G. Ujvári Balázs (1977-) (fizikus)
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5.

001-es BibID:BIBFORM113364
035-os BibID:(cikkazonosító)024914 (Scopus)85149624348 (WoS)000982377900006
Első szerző:PHENIX Collaboration
Cím:Low-pT direct-photon production in Au+Au collisions at root{s_NN} = 39 and 62.4 GeV / PHENIX Collaboration
Dátum:2023
ISSN:2469-9985 2469-9993
Megjegyzések:The measurement of direct photons from Au + Au collisions at ,/sNN = 39 and 62.4 GeV in the transverse-momentum range 0.4 < pT < 3 Gev/c is presented by the PHENIX collaboration at the BNLRelativistic Heavy Ion Collider. A significant direct-photon yield is observed in both collision systems. A universal scaling is observed when the direct-photon pT spectra for different center-of-mass energies and for different centrality selections at ,/sNN = 62.4 GeV is scaled with (dNch/d eta)alpha for alpha = 1.21 +/- 0.04. This scaling also holds true for direct-photon spectra from Au + Au collisions at ,/sNN = 200 GeV measured earlier by PHENIX, as well as the spectra from Pb + Pb at ,/sNN = 2760 GeV published by ALICE. The scaling power alpha seems to be independent of pT, center of mass energy, and collision centrality. The spectra from different collision energies have a similar shape up to pT of 2 Gev/c. The spectra have a local inverse slope Teff increasing with pT of 0.174 +/- 0.018 Gev/c in the range 0.4 < pT < 1.3 Gev/c and increasing to 0.289 +/- 0.024 Gev/c for 0.9 < pT < 2.1 Gev/c. The observed similarity of low-pT direct-photon production from ,/sNN = 39 to 2760 GeV suggests a common source of direct photons for the different collision energies and event centrality selections, and suggests a comparable space-time evolution of direct-photon emission.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Physical Review C. - 107 : 2 (2023), p. 1-8. -
További szerzők:Abdulameer, Nour Jalal Firak, Daniel Scheres Imrek József (1980-) Majoros Tamás (1991-) (mérnök, informatikus) Orosz M. Sun, Zhiyu Ujvári Balázs (1977-) (fizikus)
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6.

001-es BibID:BIBFORM113294
035-os BibID:(WoS)000964091200004 (Scopus)85151320125 (cikkazonosító)052012
Első szerző:PHENIX Collaboration
Cím:Improving constraints on gluon spin-momentum correlations in transversely polarized protons via midrapidity open-heavy-flavor electrons in p^[uparrow] plus p collisions at root{s}=200 GeV / PHENIX Collaboration
Dátum:2023
ISSN:2470-0010 2470-0029
Megjegyzések:Polarized proton-proton collisions provide leading-order access to gluons, presenting an opportunity to constrain gluon spin-momentum correlations within transversely polarized protons and enhance our understanding of the three-dimensional structure of the proton. Midrapidity open-heavy-flavor production ffiffiat p s1/4 200 GeV is dominated by gluon-gluon fusion, providing heightened sensitivity to gluon dynamics relative to other production channels. Transverse single-spin asymmetries of positrons and electrons from heavy-flavor hadron decays are measured at midrapidity using the PHENIX detector at the Relativistic Heavy Ion Collider. These charge-separated measurements are sensitive to gluon correlators that can in principle be related to gluon orbital angular momentum via model calculations. Explicit constraints on gluon correlators are extracted for two separate models, one of which had not been constrained previously.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Physical Review D. - 107 : 5 (2023), p. 1-8. -
További szerzők:Abdulameer, Nour Jalal Firak, Daniel Scheres Lovász K. (fizikus) Majoros Tamás (1991-) (mérnök, informatikus) Orosz M. Sun, Zhiyu Tarnai G. Ujvári Balázs (1977-) (fizikus)
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