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

Adare, A. and Adler, S. S. and Afanasiev, S. and Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Al-Bataineh, H. and Al-Jamel, A. and Alexander, J. and Angerami, A. and Aoki, K. and Apadula, N. and Aphecetche, L. and Aramaki, Y. and Armendariz, R. and Aronson, S. H. and Asai, J. and Atomssa, E. T. and Averbeck, R. and Awes, T. C. and Azmoun, B. and Babintsev, V. and Bai, M. and Baksay, G. and Baksay, L. and Baldisseri, A. and Barish, K. N. and Barnes, P. D. and Bassalleck, B. and Basye, A. T. and Csanád, Máté and Csörgő, Tamás and Dávid, Gábor and Hidas, Pál and Imrek, József and Kiss, Ádám and Nagy, Márton and Ster, András and Sziklai, János István and Tarján, Péter and Vértesi, Róbert and Veszprémi, Viktor and Zimányi, József (2013) Direct photon production in d+Au collisions at √sNN=200 GeV. PHYSICAL REVIEW C, 87 (5). ISSN 2469-9985

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Abstract

Direct photons have been measured in √sN N = 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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