Azimuthal-angle dependence of charged-pion-interferometry measurements with respect to 2nd- and 3 rd-order event planes 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 (2014) Azimuthal-angle dependence of charged-pion-interferometry measurements with respect to 2nd- and 3 rd-order event planes in Au+Au collisions at √sNN = 200 GeV. PHYSICAL REVIEW LETTERS, 112 (22). ISSN 0031-9007

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Abstract

Charged-pion-interferometry measurements were made with respect to the 2nd- and 3rd-order event plane for Au+Au collisions at √sNN = 200 GeV. A strong azimuthal-angle dependence of the extracted Gaussian-source radii was observed with respect to both the 2nd- and 3rd-order event planes. The results for the 2nd-order dependence indicate that the initial eccentricity is reduced during the medium evolution, but not reversed in the final state, which is consistent with previous results. In contrast, the results for the 3rd-order dependence indicate that the initial triangular shape is significantly reduced and potentially reversed by the end of the medium evolution, and that the 3rd-order oscillations are largely dominated by the dynamical effects from triangular flow.

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