2006/11/30 by Chihiro Sasaki, C. Sasaki, Bengt Friman +2 · 5 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph #nucl-th
paper · pdf · doi:10.1103/physrevd.75.054026
published as Phys.Rev.D75:054026,2007 · 33 pages, 11 figures; final version accepted for publication in Phys. Rev. D
arxiv created 2007/03/08 · openalex publication_date 2007/03/21 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We discuss the net quark and isovector fluctuations as well as off-diagonal quark flavor susceptibilities along the chiral phase transition line in the Nambu-Jona-Lasinio (NJL) model. The model is formulated at nonzero quark and isospin chemical potentials with nonvanishing vector couplings in the isoscalar and isovector channels. We study the influence of the quark chemical potential on the quark flavor susceptibilities in detail and the dependence of the results on model parameters as well as on the quark mass. The NJL model findings are compared with recent lattice results obtained in two-flavor QCD at finite chemical potential. On a qualitative level, the NJL model provides a consistent description of the dependence of quark number fluctuations on temperature and baryon chemical potential. The phase diagram and the position of the tricritical point in the NJL model are also discussed for different parameter sets.