Collisional energy loss of heavy quarks

Details Collisional energy loss of heavy quarks Collisional energy loss of heavy quarks

2012-04-11

arxiv.org/abs/1204.2397v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 8 figures, 1 table, submitted to Physics Letters B

Scientific paper

An analytic leading log formula for the averaged elastic energy loss of a heavy quark is found in the case of a non-static thermalized quark gluon plasma. Beyond the mean energy loss the collisional quenching of heavy quarks is considered in an improved pQCD transition matrix approach taking into account quantum distribution functions of medium particles, a running coupling and an effective screening mass adjusted to HTL calculations. The results for the nuclear modification factor and elliptic flow for RHIC energies within this model indicate a large contribution of the collisional energy loss of heavy quarks to their total quenching. Thereby hints for a qualitative difference between $R_{AA}$ and $v_2$ were found, such that a linear scaling of the binary cross section cannot explain both effects at the same time. Therefore radiative energy loss and more precise initial conditions for the medium have to be taken into consideration.

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