Centrality dependence of low-momentum direct-photon production in Au+Au collisions at sqrt(s_NN)=200 GeV (CROSBI ID 226425)
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Podaci o odgovornosti
Adare, A. ; ... ; Makek, Mihael ; ... ; Zolin, L.
PHENIX Collaboration
engleski
Centrality dependence of low-momentum direct-photon production in Au+Au collisions at sqrt(s_NN)=200 GeV
The PHENIX experiment at RHIC has measured the centrality dependence of the direct photon yield from Au+Au collisions at sqrt(s_NN)=200 GeV down to pT=0.4 GeV/c. Photons are detected via photon conversions to e+e− pairs and an improved technique is applied that minimizes the systematic uncertainties that usually limit direct photon measurements, in particular at low pT. We find an excess of direct photons above the Ncoll-scaled yield measured in p+p collisions. This excess yield is well described by an exponential distribution with an inverse slope of about 240MeV/c in the pT range 0.6–2.0 GeV/c. While the shape of the pT distribution is independent of centrality within the experimental uncertainties, the yield increases rapidly with increasing centrality, scaling approximately with Nαpart, where α=1.38±0.03(stat)±0.07(syst).
QGP ; direct photons ; PHENIX
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Podaci o izdanju
91 (6)
2015.
064904
11
objavljeno
0556-2813
1089-490X
10.1103/PhysRevC.91.064904