https://doi.org/10.1140/epjc/s10052-015-3720-2
Regular Article - Theoretical Physics
Critical behaviors near the (tri-)critical end point of QCD within the NJL model
1
Department of Physics, Nanjing University, Nanjing, 210093, China
2
Joint Center for Particle, Nuclear Physics and Cosmology, Nanjing, 210093, China
3
State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, CAS, Beijing, 100190, China
* e-mail: zonghs@nju.edu.cn
Received:
4
August
2015
Accepted:
2
October
2015
Published online:
19
October
2015
We investigate the dynamical chiral symmetry breaking and its restoration at finite density and temperature within the two-flavor Nambu–Jona–Lasinio model, and mainly focus on the critical behaviors near the critical end point (CEP) and tricritical point (TCP) of quantum chromodynamics. The multi-solution region of the Nambu and Wigner ones is determined in the phase diagram for the massive and massless current quark, respectively. We use the various susceptibilities to locate the CEP/TCP and then extract the critical exponents near them. Our calculations reveal that the various susceptibilities share the same critical behaviors for the physical current quark mass, while they show different features in the chiral limit.
© SIF and Springer-Verlag Berlin Heidelberg, 2015
