# Direct photon production in d+Au collisions at √sNN=200 GeV

Abstract : Direct photons have been measured in √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 attributable to a source other than the initial-state nuclear effects.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00837868
Contributor : Dominique Girod <>
Submitted on : Monday, June 24, 2013 - 2:22:15 PM
Last modification on : Wednesday, September 16, 2020 - 4:08:14 PM

### Citation

A. Adare, Laurent Aphecetche, X. Camard, Jean-Pierre Cussonneau, H. Delagrange, et al.. Direct photon production in d+Au collisions at √sNN=200 GeV. Physical Review C, American Physical Society, 2013, 87, pp.054907. ⟨10.1103/PhysRevC.87.054907⟩. ⟨in2p3-00837868⟩

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