Anisotropic parton escape is the dominant source of azimuthal anisotropy in transport models

By Liang He, T. Edmonds, Zi-Wei Lin, Feng Liu, D. Molnár, Fuqiang Wang. 2015

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Abstract We trace the development of azimuthal anisotropy ( v n , n = 2 , 3 ) via parton–parton collision history in two transport models. The parton v n is studied as a function of the number of collisions of each parton in Au + Au and d + Au collisions at s NN = 200  GeV . It is found that the majority of v n comes from the anisotropic escape probability of partons, with no fundamental difference at low and high transverse momenta. The contribution to v n from hydrodynamic-type collective flow is found to be small. Only when the parton–parton cross-section is set unrealistically large does this contribution start to take over. Our findings challenge the current paradigm emerged from hydrodynamic comparisons to anisotropy data.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/2d64dd163cdab7b374819326ae2055469019b46f