Direct photons at low $p_{T}$ measured in PHENIX

Details Direct photons at low $p_{T}$ measured in PHENIX Direct photons at low $p_{T}$ measured in PHENIX

2007-02-12

arxiv.org/abs/nucl-ex/0702025v1

J.Phys.G34:S869-872,2007

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 3 figures, proceedings for Quark Matter 2006

Scientific paper

10.1088/0954-3899/34/8/S115

Direct photon spectra measured at small $p_T$ in p+p, d+Au and Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV are presented. Several measurement techniques including statistical subtraction, tagging, and internal and external conversion were applied and found to produce consistent results. The p+p and d+Au results are found to be in very good agreement with pQCD predictions over the entire $p_T$ range. No excess of direct photons in Au+Au collisions with respect to binary scaled d+Au data is observed within systematic errors.

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