The gluon plasma at RHIC

Details The gluon plasma at RHIC The gluon plasma at RHIC

2001-11-29

arxiv.org/abs/hep-ph/0111401v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 5 figures in eps, talk given at XXXI International Symposium on Multiparticle Dynamics, Sept 1-7, 2001, Datong China.

Scientific paper

Differential elliptic flow and particle spectra are calculated from covariant Boltzmann transport theory taking into account the finite transport opacity of the gluon plasma produced in Au+Au at $E_{cm}\sim 130$ $A$ GeV at RHIC. The solutions are shown to depend mainly on the transport opacity, $\chi=\int dz \sigma_t\rho_g$. The elliptic flow saturation pattern reported by STAR indicates that $\chi_{b=0} \sim 25$, i.e., the gluon plasma is $\sim 80$ times more opaque than the pQCD estimate based on HIJING. Such large opacities are also consistent with the measured charged hadron spectra.

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