Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2005-12-07
Acta Phys.Polon. B37 (2006) 727-732
Physics
High Energy Physics
High Energy Physics - Experiment
5 pages, 3 figures, to be published in the proceedings of the PHOTON2005 International Conference on the Structure and Interac
Scientific paper
Direct-photon measurements in p+p and Au+Au collisions at sqrt{s_{NN}} = 200 GeV from the PHENIX experiment are presented. The p+p results are found to be in good agreement with next-to-leading-order (NLO) perturbative QCD calculations. Direct-photon yields in Au+Au collisions scale with the number of inelastic nucleon-nucleon collisions and don't exhibit the strong suppression observed for charged hadrons and neutral pions. This observation is consistent with models which attribute the suppression of high-pT hadrons to energy loss of quarks and gluons in the hot and dense medium produced in Au+Au collisions at RHIC.
for the PHENIX Collaboration
Reygers Klaus
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