Direct photon production in d+Au collisions at sqrt(sNN)=200 GeV
Abstract
Direct photons have been measured in sqrt(sNN)=200 GeV d+Au collisions at midrapidity. A wide pT range is covered by measurements of nearly-real virtual photons (1<pT<6 GeV/c) and real photons (5<pT<16 GeV/c). The invariant yield of the direct photons in d+Au collisions over the scaled p+p cross section is consistent with unity. Theoretical calculations assuming standard cold nuclear matter effects describe the data well for the entire pT range. This indicates that the large enhancement of direct photons observed in Au+Au collisions for 1.0<pT<2.5 GeV/c is due to a source other than the initial-state nuclear effects.
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