Direct Photon Measurements at PHENIX

Sahlmueller, B. and Adare, A. and Afanasiev, S. and Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Akimoto, R. and Al-Bataineh, H. and Al-Ta’ani, H. and Alexander, J. and Andrews, K. R. and Angerami, A. and Aoki, K. and Apadula, N. and Aphecetche, L. and Appelt, E. and Aramaki, Y. and Armendariz, R. and Aronson, S. H. and Asai, J. and Asano, H. and Aschenauer, E. C. and Atomssa, E. T. and Averbeck, R. and Awes, T. C. and Azmoun, B. and Babintsev, V. and Bai, M. and Bai, X. and Baksay, G. and Csanád, Máté and Csörgő, Tamás and Imrek, József and Kiss, Ádám and Varga-Kőfaragó, Mónika and Nagy, Márton and Novák, Tamás and Ster, András and Sziklai, János István and Tarján, Péter and Vértesi, Róbert and Zimányi, József (2013) Direct Photon Measurements at PHENIX. NUCLEAR PHYSICS A, 910. pp. 209-210. ISSN 0375-9474

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Abstract

PHENIX has measured direct photons in p+p and Au+Au collisions at √sNN = 200 GeV. The p+p measurement is in good agreement with pQCD expectations. The nuclear modification factor in Au+Au is found to be consistent with unity for all centralities, and is compared to theoretical models. The data are found in agreement with models that take into account initial state modifications, as well as with those that account also for final state modifications.

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