Search for direct photons in p+Pb and p+C collisions at sqrt(sNN) = 17.4 GeV

Abstract

Upper limits on direct photon production were determined as a function of the transverse momentum for 0.7 < pT <= 3.2 GeV/c with the WA98 experiment in p+C and p+Pb collisions at sqrt(sNN) = 17.4 GeV. The results are compared to direct photon measurements in Pb+Pb collisions at sqrt(sNN) = 17.3 GeV by WA98. Implications for a possible thermal direct photon contribution are discussed.

4 pages, 3 figures, to appear in the proceedings of the Quark Matter 2008 conference, Jaipur, India, 4-10 Feb 2008