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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 ?sNN = 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 (cikkazonosító)024914. -
További szerzők:Abdulameer, Nour Jalal Firak, Daniel Scheres Imrek József (1980-) Majoros Tamás (1991-) (mérnök, informatikus) Orosz Miklós Sun, Zhiyu Ujvári Balázs (1977-) (fizikus)
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001-es BibID:BIBFORM113361
035-os BibID:(Scopus)85149675672 (WoS)000989218200001 (cikkazonosító)024907
Első szerző:PHENIX Collaboration
Cím:Measurements of second-harmonic Fourier coefficients from azimuthal anisotropies in p plus p, p plus Au, d + Au, and 3He+Au collisions at root sNN=200 GeV / PHENIX Collaboration
Dátum:2023
ISSN:2469-9985 2469-9993
Megjegyzések:Recently, the PHENIX Collaboration has published second-and third-harmonic Fourier coefficients v2 and v3 for midrapidity (|eta| < 0.35) charged hadrons in 0%-5% central p + Au, d + Au, and 3He +Au collisions at N/sNN = 200 GeV, utilizing three sets of two-particle correlations for two detector combinations with different pseudorapidity acceptance [Acharya et al., Phys. Rev. C 105, 024901 (2022)]. This paper extends these measurements of v2 to all centralities in p + Au, d + Au, and 3He +Au collisions, as well as p + p collisions, as a function of transverse momentum (pT) and event multiplicity. The kinematic dependence of v2 is quantified as the ratio R of v2 between the two detector combinations as a function of event multiplicity for 0.5 < pT < 1 and 2 < pT < 2.5 GeV/c. A multiphase-transport (AMPT) model can reproduce the observed v2 in most-central to midcentral d + Au and 3He +Au collisions. However, the AMPT model systematically overestimates the measurements in p + p, p + Au, and peripheral d + Au and 3He +Au collisions, indicating a higher nonflow contribution in the AMPT model than in the experimental data. The AMPT model fails to describe the observed R for 0.5 < pT < 1 GeV/c, but there is qualitative agreement with the measurements for 2 < pT < 2.5 GeV/c.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Physical Review C. - 107 : 2 (2023), p. 1-8 (cikkazonosító)024907. -
További szerzők:Abdulameer, Nour Jalal Firak, Daniel Scheres Imrek József (1980-) Lovász K. Majoros Tamás (1991-) (mérnök, informatikus) Orosz Miklós Sun, Zhiyu Tarnai G. Ujvári Balázs (1977-) (fizikus)
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
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