We present a quantitative study of vorticity for- mation in peripheral ultrarelativistic heavy-ion collisions at √sNN = 200 GeV by using the ECHO-QGP numerical code, implementing relativistic dissipative hydrodynamics in the causal Israel–Stewart framework in 3 + 1 dimensions with an initial Bjorken flow profile. We consider different defini- tions of vorticity which are relevant in relativistic hydrody- namics. After demonstrating the excellent capabilities of our code, which proves to be able to reproduce Gubser flow up to 8 fm/c, we show that, with the initial conditions needed to reproduce the measured directed flow in peripheral collisions corresponding to an average impact parameter b = 11.6 fm and with the Bjorken flow profile for a viscous Quark Gluon Plasma with η/s = 0.1 fixed, a vorticity of the order of some 10−2 c/fm can develop at freeze-out. The ensuing polariza- tion of baryons does not exceed 1.4 % at midrapidity. We show that the amount of developed directed flow is sensitive to both the initial angular momentum of the plasma and its viscosity.

A study of vorticity formation in high energy nuclear collisions / Becattini, F.; Inghirami, G.; Rolando, V.; Beraudo, A.; Del Zanna, L.; De Pace, A.; Nardi, M.; Pagliara, G.; Chandra, V.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - STAMPA. - 75:(2015), pp. 1-14. [10.1140/epjc/s10052-015-3624-1]

A study of vorticity formation in high energy nuclear collisions

BECATTINI, FRANCESCO;INGHIRAMI, GABRIELE;DEL ZANNA, LUCA;
2015

Abstract

We present a quantitative study of vorticity for- mation in peripheral ultrarelativistic heavy-ion collisions at √sNN = 200 GeV by using the ECHO-QGP numerical code, implementing relativistic dissipative hydrodynamics in the causal Israel–Stewart framework in 3 + 1 dimensions with an initial Bjorken flow profile. We consider different defini- tions of vorticity which are relevant in relativistic hydrody- namics. After demonstrating the excellent capabilities of our code, which proves to be able to reproduce Gubser flow up to 8 fm/c, we show that, with the initial conditions needed to reproduce the measured directed flow in peripheral collisions corresponding to an average impact parameter b = 11.6 fm and with the Bjorken flow profile for a viscous Quark Gluon Plasma with η/s = 0.1 fixed, a vorticity of the order of some 10−2 c/fm can develop at freeze-out. The ensuing polariza- tion of baryons does not exceed 1.4 % at midrapidity. We show that the amount of developed directed flow is sensitive to both the initial angular momentum of the plasma and its viscosity.
2015
75
1
14
Becattini, F.; Inghirami, G.; Rolando, V.; Beraudo, A.; Del Zanna, L.; De Pace, A.; Nardi, M.; Pagliara, G.; Chandra, V.
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1009945
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