Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-01-17
Phys.Rev.C81:054901,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, 10 figures; minor modification, references added
Scientific paper
10.1103/PhysRevC.81.054901
We calculate the elliptic flow parameter $v_2$ for Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV employing the parton cascade BAMPS (Boltzmann Approach of Multiparton Scatterings). Besides gluon interactions including the bremsstrahlung process, interactions with quarks are considered in an effective, but approximate way to investigate the dependence of the collective flow on the number of parton degrees of freedom. We find that $v_2$ as a function of the transverse momentum $p_T$ is sensitive to the number of parton degrees of freedom, whereas the $p_T$ averaged $v_2$ does not. When including quarks, $v_2(p_T)$ shifts to lower $p_T$, the parton transverse momentum spectra become softer and the mean parton transverse momenta decrease.
Greiner Carsten
Xu Zhe
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