Direct photons at low $p_{T}$ measured in PHENIX
Abstract
Description
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.
4 pages, 3 figures, proceedings for Quark Matter 2006
4 pages, 3 figures, proceedings for Quark Matter 2006