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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 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 Miklós Sun, Zhiyu Ujvári Balázs (1977-) (fizikus)
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