Direct photon production in d+Au collisions at root s(NN)=200 GeV

Date
2013-05-17
Authors
Adare, Andrew
Belikov, Sergey
Ogilvie, Craig
Constantin, Paul
Dion, Alan
Grau, Nathan
Hill, John
Kempel, Todd
Lajoie, John
Lebedev, Alexandre
Ogilvie, Craig
Pei, H.
Rak, Jan
Rosati, Marzia
Semenov, Alexey
Silva, C.
Vale, Carla
Wei, Feng
Wohn, F.
Zong, X.
et al.
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Abstract

Direct photons have been measured in root s(NN) = 200 GeV d + Au collisions at midrapidity. A wide p(T) range is covered by measurements of nearly real virtual photons (1 < p(T) < 6 GeV/c) and real photons (5 < p(T) < 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 p(T) range. This indicates that the large enhancement of direct photons observed in Au + Au collisions for 1.0 < p(T) < 2.5 GeV/c is attributable to a source other than the initial-state nuclear effects.

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This is an article from Physical Review C 87 (2013): 054907-1, doi:10.1103/PhysRevC.87.054907. Posted with permission.

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