Azimuthal anisotropy of π 0 and η mesons in Au+Au collisions at √sNN = 200 GeV

Adare, A. and Afanasiev, S. and Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Al-Bataineh, H. and Alexander, J. and Aoki, K. and Aramaki, Y. 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 Barish, K. N. and Bassalleck, B. and Basye, A. T. and Bathe, S. and Baublis, V. and Baumann, C. and Bazilevsky, A. and Belikov, S. and Belmont, R. and Bennett, R. and Berdnikov, A. and Berdnikov, Y. and Bickley, A. A. and Csanád, Máté and Csörgő, Tamás and Dávid, Gábor and Kiss, Ádám and Nagy, Márton and Sziklai, János István and Tarján, Péter and Vértesi, Róbert (2013) Azimuthal anisotropy of π 0 and η mesons in Au+Au collisions at √sNN = 200 GeV. PHYSICAL REVIEW C, 88 (6). ISSN 2469-9985

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Abstract

The azimuthal anisotropy coefficients v2 and v4 of π 0 and η mesons are measured in Au+Au collisions at √ sNN = 200 GeV as a function of transverse momentum pT (1–14 GeV/c) and centrality. The extracted v2 coefficients are found to be consistent between the two meson species over the measured pT range. The ratio of v4/v2 2 for π 0 mesons is found to be independent of pT for 1–9 GeV/c, implying a lack of sensitivity of the ratio to the change of underlying physics with pT . Furthermore, the ratio of v4/v2 2 is systematically larger in central collisions, which may reflect the combined effects of fluctuations in the initial collision geometry and finite viscosity in the evolving medium.

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