Energy Loss of Heavy Quarks in a QGP with a Running Coupling Constant Approach

We show that the effective running coupling constant, αeff, and the effective regulator, , which we used recently to calculate the energy loss, , and the elliptic flow, v2, of heavy quarks in an expanding quark gluon plasma plasma (QGP) [P. B. Gossiaux and J. Aichelin, Phys. Rev. C78, 014904 (2008), [arXiv:0802.2525], P. B. Gossiaux and J. Aichelin, J. Phys. G36 (2009) 064028, [arXiv:0901.2462], P. B. Gossiaux, R. Bierkandt and J. Aichelin, Phys. Rev. C79 (2009) 044906 [arXiv:0901.0946]] are compatible with lattice results and with recently advanced analytical pQCD calculation.