Heavy quarks at RHIC from parton transport theory

There are several indications that an opaque partonic medium is created in energetic Au+Au collisions ( √ sNN ∼ 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 √ sNN = 200 GeV indicates significant heavy quark rescattering, corresponding 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. PACS. 25.75.-q Relativistic heavy-ion collisions – 25.75.Ld Collective flow – 25.75.Gz Particle correlations