Quark number susceptibilities at finite quark chemical potential are investigated in the framework of the Polyakov-loop-extended Nambu Jona-Lasinio (PNJL) model. A detailed comparison is performed between the available lattice data, extrapolated using a Taylor expansion around vanishing chemical potential, and PNJL results consistently obtained from a Taylor series truncated at the same order. The validity of the Taylor expansion is then examined through a comparison between the full and truncated PNJL model calculations.
@article{arxiv.hep-ph/0701091,
title = {Quark number susceptibilities: lattice QCD versus PNJL model},
author = {Claudia Ratti and Simon Roessner and Wolfram Weise},
journal= {arXiv preprint arXiv:hep-ph/0701091},
year = {2008}
}