Eur. Phys. J. C (2007) 49: 231-234
https://doi.org/10.1140/epjc/s10052-006-0116-3

Regular Article – Experimental Physics

Direct photons in d+Au collisions at  =200 GeV with STAR

Utrecht University, Utrecht, The Netherlands

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Received: 15 August 2006
Published online: 30 November 2006

Abstract

Results are presented of an ongoing analysis of direct photon production in  =200 GeV deuteron-gold collisions (d+Au) with the STAR experiment at RHIC. A significant excess of direct photons is observed near mid-rapidity (0<y<1) and found to be consistent with next-to-leading order pQCD calculations including the contribution from fragmentation photons.