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

Christian Lang (Fakultät für Physik, Universität Bielefeld, Postfach 100131, 33501, Bielefeld, Germany) ; Nicolas Borghini (Fakultät für Physik, Universität Bielefeld, Postfach 100131, 33501, Bielefeld, Germany)

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.

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      "value": "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."
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Published on:
17 July 2014
Publisher:
Springer/Società Italiana di Fisica
Published in:
European Physical Journal C (2014)
Issue 7
DOI:
https://doi.org/10.1140/epjc/s10052-014-2955-7
Copyrights:
The Author(s)
Licence:
CC-BY-3.0

Fulltext files: