Measurements of direct photons in Au+Au collisions with PHENIX

Bannier, 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 Alfred, M. 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 Csanád, Máté and Csörgő, Tamás and Imrek, József and Varga-Kőfaragó, Mónika and Nagy, Márton and Novák, Tamás and Ster, András and Sziklai, János István and Tarján, Péter and Vargyas, Márton and Vértesi, Róbert and Zimányi, József (2014) Measurements of direct photons in Au+Au collisions with PHENIX. NUCLEAR PHYSICS A, 932. pp. 212-217. ISSN 0375-9474

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Abstract

The PHENIX experiment has published direct photon yields and elliptic flow coefficients v2 from Au+Au collisions at RHIC energies. These results have sparked much theoretical discussion. The measured yields and flow parameters are difficult to reconcile in current model calculations of thermal radiation based on hydrodynamic time evolution of the collision volume. Our latest analyses which use high statistics data from the 2007 and 2010 runs allow the determination of direct photon yields with finer granularity in centrality and photon momentum and down to pT as low as 0.4 GeV/c. We will summarize the current status and present new results from PHENIX.

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