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HK: Fachverband Physik der Hadronen und Kerne

HK 14: Theorie

HK 14.3: Vortrag

Dienstag, 13. März 2007, 14:45–15:00, C

Energy Loss of Charm Quarks Passing Hot Deconfined Matter — •Henry Schade¹, Ronny Thomas², and Burkhard Kämpfer² — ¹Institut für Theoretische Physik, TU Dresden, 01062 Dresden, Germany — ²Forschungszentrum Dresden-Rossendorf, PF 510119, 01314 Dresden, Germany

Recent results from RHIC for the nuclear modification factor R_AA for charmed hadrons seem to challenge the previous paradigm: Collisional energy loss of charm (and bottom) quarks needs to supplement the celebrated radiative energy loss when passing a deconfined medium. We present results of numerical evaluations of these processes in leading tree-level order of opacity, where finite quark masses and finite energies are exactly accounted for. Dynamical quark-quark scattering is compared with the often employed potential scattering model. Collinear divergences are screened by effective gluon masses, representing the QCD analog of the Ter-Mikaelian (longitudinal density) effect in QED. This modifies also the dead cone suppression. In such a way, an important piece of a complete formalism for jet quenching in relativistic heavy ions is provided.