| THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS |
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The Quark Number Susceptibility of QCD at Finite Temperature and Chemical Potential |
| ZHU Hui-Xia1,2, SUN Wei-Min1,3,4, ZONG Hong-Shi1,3,4 |
1Department of Physics, Nanjing University, Nanjing 210093
2The College of Physics and Electronic Information, Anhui Normal University, Wuhu 241000
3Joint Center for Particle, Nuclear Physics and Cosmology, Nanjing 210093
4State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190
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| Cite this article: |
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ZHU Hui-Xia, SUN Wei-Min, ZONG Hong-Shi 2013 Chin. Phys. Lett. 30 051201 |
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Abstract We calculate the quark number density and quark number susceptibility (QNS) of QCD at finite chemical potential μ and finite temperature T in the framework of a new nonperturbative QCD model. Analysis and discussions of the calculated results of the QNS are given. It is found that the quark number density has a singularity when μ comes close to a critical value μ0, and the QNS χ(μ,T) becomes discontinuous at some values of T. At high temperature the QNS approaches the free quark gas result, while at very low temperature the QNS equals zero. Importantly, the QNS shows a sudden increase near some temperature (T～120 MeV), which may be regarded as the signal of a crossover.
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Received: 23 October 2012
Published: 31 May 2013
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