Fourth-order Correlations of Conserved Charges in the QCD Thermodynamics

2010/10/05 by Wei-jie Fu, Wei‐jie Fu, Fu, Wei-jie +3
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Physics of Superconductivity and Magnetism #hep-ph

paper · pdf · doi:10.48550/arxiv.1010.0892

13 pages, 4 figures

arxiv created 2010/10/05 · openalex publication_date 2010/10/05 · arxiv updated 2015/03/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The fourth-order correlations of conserved charges, such as the baryon number, electric charge, and strangeness, are studied at finite temperature and nonzero baryon chemical potential in an effective model. It is found that the fourth-order correlations change rapidly and have three extrema during the chiral crossover with the increase of the baryon chemical potential. The absolute values of the extrema approach infinity when the thermodynamical system moves toward the QCD critical point and the fourth-order correlations are divergent at the critical point. The contour plots of the fourth-order correlations in the plane of the temperature and baryon chemical potential are given. It is noticed that all the fourth-order correlations of conserved charges, except for χ₁₃^BS and χ₁₃^QS, are excellent probes to explore the QCD critical point in heavy ion collision experiments.

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