Abstract
We show that the effective running coupling constant, α eff , and the effective regulator, κ m ˜ D 2 , which we used recently to calculate the energy loss, d E d x , and the elliptic flow, v 2 , 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.
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