Neutral pion production in Au + Au collisions at RHIC

Vértesi, Róbert 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, Árpád and Varga-Kőfaragó, Mónika and Nagy, Márton and Ster, András and Sziklai, János István and Tarján, Péter and Zimányi, József (2013) Neutral pion production in Au + Au collisions at RHIC. NUCLEAR PHYSICS A, 910-91. pp. 331-334. ISSN 0375-9474

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Abstract

New results from the 2010 RHIC low energy program show a substantial suppression of neutral pions in central Au+Au collisions at both √sNN =39 and 62.4 GeV c.m.s. energies. At high pT the 62.4 GeV and 200 GeV data follow the same suppression pattern. On the other hand, otherwise successful pQCD predictions do not describe the 39 GeV data. These observations indicate that initial state effects may play a dominant role at smaller c.m.s. energies and at lower pT. The azimuthal dependence of the nuclear modification factor RAA is strongly correlated with the (approximately elliptical) geometry of the overlap region. The dependence of RAA on the reaction plane, determined up to pT=20 GeV/c from 2007 high-luminosity √sNN =200 GeV Au+Au data provides great selectivity among theories, and favours the ASW scenario with AdS/CFT correspondence over the pQCD-based models.

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