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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. 1-8. -
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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