cea-01323571
https://cea.hal.science/cea-01323571
https://cea.hal.science/cea-01323571/document
https://cea.hal.science/cea-01323571/file/1502.04066v2.pdf
arxiv:1502.04066
doi:10.1016/j.nuclphysa.2015.06.005
[CEA] CEA - Commissariat à l'énergie atomique
[CNRS] CNRS - Centre national de la recherche scientifique
[OPENAIRE] OpenAIRE
[DSM-IPHT] IPHT
[CEA-UPSAY] CEA - Université Paris-Saclay
[UNIV-PARIS-SACLAY] Université Paris-Saclay
[CEA-UPSAY-SACLAY] CEA-UPSAY-SACLAY
[CEA-DRF] Direction de Recherche Fondamentale
[GS-MATHEMATIQUES] Graduate School Mathématiques
[GS-PHYSIQUE] Graduate School Physique
Viscous corrections to anisotropic flow and transverse momentum spectra from transport theory
Plumari, Salvatore
Guardo, Giovanni Luca
Greco, Vincenzo
Ollitrault, Jean-Yves
[PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th]
[PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
ART
Viscous hydrodynamics is commonly used to model the evolution of the matter created in an ultra-relativistic heavy-ion collision. It provides a good description of transverse momentum spectra and anisotropic flow. These observables, however, cannot be consistently derived using viscous hydrodynamics alone, because they depend on the microscopic interactions at freeze-out. We derive the ideal hydrodynamic limit and the first-order viscous correction to anisotropic flow ($v_2$, $v_3$ and $v_4$) and momentum spectrum using a transport calculation. The linear response coefficient to the initial anisotropy, $v_n(p_T)/\varepsilon_n$, depends little on $n$ in the ideal hydrodynamic limit. The viscous correction to the spectrum depends not only on the differential cross section, but also on the initial momentum distribution. This dependence is not captured by standard second-order viscous hydrodynamics. The viscous correction to anisotropic flow increases with $p_T$, but this increase is slower than usually assumed in viscous hydrodynamic calculations. In particular, it is too slow to explain the observed maximum of $v_n$ at $p_T\sim 3$ GeV/c.
2015
2016-05-30
en
Nuclear Physics A
Elsevier