Thursday, April 12, 2012

1204.2397 (Alex Meistrenko et al.)

Collisional energy loss of heavy quarks    [PDF]

Alex Meistrenko, Andre Peshier, Jan Uphoff, Carsten Greiner
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.
View original: http://arxiv.org/abs/1204.2397

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