Dissipative corrections to particle spectra and anisotropic flow from a saddle-point approximation to kinetic freeze out

Abstract

A significant fraction of the changes in momentum distributions induced by dissipative phenomena in the description of the fluid fireball created in ultrarelativistic heavy-ion collisions actually take place when the fluid turns into individual particles. We study these corrections in the limit of a low freeze-out temperature of the flowing medium, and we show that they mostly affect particles with a higher velocity than the fluid. For these, we derive relations between different flow harmonics, from which the functional form of the dissipative corrections could ultimately be reconstructed from experimental data.

v2 (accepted for publication): 11 pages, 3 figures

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• Momentum spectra, anisotropic flow, and ideal fluids
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• Elliptic and Triangular Flow of Identified Particles from the AMPT Model at RHIC Energies