Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2006-08-29
Eur.Phys.J.C49:181-186,2007
Physics
Nuclear Physics
Nuclear Theory
Talk at Hot Quarks 2006, Int. Workshop, May 15-20, 2006, Villasimius, Sardinia, Italy. 6 pages, 8 EPS figures, EPJ stylefile
Scientific paper
10.1140/epjc/s10052-006-0127-0
There are several indications that an opaque partonic medium is created in energetic Au+Au collisions \sqrt{s} ~ 100 GeV/nucleon at the Relativistic Heavy Ion Collider (RHIC). At the extreme densities of ~ 10-100 times normal nuclear density reached even heavy-flavor hadrons are affected significantly. Heavy-quark observables are presented from the parton transport model MPC, focusing on the nuclear suppression pattern, azimuthal anisotropy ("elliptic flow"), and azimuthal correlations. Comparison with Au+Au data at top RHIC energy \sqrt{s} = 200 GeV indicates significant heavy quark rescattering, corresponding to roughly five times higher opacities than estimates based on leading-order perturbative QCD. We propose measurements of charm-anticharm, e.g., D-meson azimuthal correlations as a sensitive, independent probe to corroborate these findings.
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