Chiral susceptibility and chiral phase transition in Nambu–Jona-Lasinio model Yue Zhao, Lei Chang, Wei Yuan and Yu-xin Liu Eur. Phys. J. C, 56 4 (2008) 483-492 Published online: 09 August 2008 DOI: 10.1140/epjc/s10052-008-0673-8