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Mapping the QCD phase diagram with susceptibilities of conserved charges within Nambu–Jona-Lasinio model

Kuang Yaming Honors School, Nanjing University, Nanjing 210093, China

Key Laboratory of Quark & Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China

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Hong-Shi Zong

Department of Physics, Nanjing University, Nanjing 210093, China

Joint Center for Particle, Nuclear Physics and Cosmology, Nanjing 210093, China

State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, CAS, Beijing 100190, China

E-mail Address: zonghs@nju.edu.cn

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https://doi.org/10.1142/S0217751X17500610Cited by:25 (Source: Crossref)

Abstract

We evaluate the second to fourth-order baryon, charge and strangeness susceptibilities near a chiral critical point using the Nambu–Jona-Lasinio model under different temperatures and baryon chemical potential. Baryon number susceptibilities are found to be of the greatest magnitude, offering the strongest signal. Whereas the strangeness susceptibilities have the smallest divergence dominating area, owing to the large strange quark mass. We also make an attempt to compare our results with experiment data. The trend at high collision energy is found to be consistent between theory and experiment. The model calculation predicts more complex behavior at low collision energies, near the postulated critical end point.

Keywords:

PACS: 12.38.Mh, 12.39.-x, 25.75.Nq

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