Quark Number Susceptibility in Hard Thermal Loop Approximation

Details Quark Number Susceptibility in Hard Thermal Loop Approximation Quark Number Susceptibility in Hard Thermal Loop Approximation

2001-11-02

arxiv.org/abs/hep-ph/0111022v4

Eur.Phys.J.C23:591-596,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages including four figures and this version is accepted for publication in Euro. Phys. J. C

Scientific paper

10.1007/s100520200899

We calculate the quark number susceptibility in the deconfined phase of QCD using the hard thermal loop (HTL) approximation for the quark propagator. This improved perturbation theory takes into account important medium effects such as thermal quark masses and Landau damping in the quark-gluon plasma. We explicitly show that the Landau damping part in the quark propagator for spacelike quark momenta does not contribute to the quark number susceptibility due to the quark number conservation. We find that the quark number susceptibility only due to the collective quark modes deviates from that of free one around the critical temperature but approaches free results at infinite temperature limit. The results are in conformity with recent lattice calculations.

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