Evaluation of particle–anti-particle scaled correlation within effective models

Journal Article · 22 October 2019 · Nuclear Physics. A

DOI: https://doi.org/10.1016/j.nuclphysa.2019.121655 · OSTI ID:1580998

Garcia, André F.  ^[1]; Koch, Volker ^[2]; Pinto, Marcus B. ^[3]

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1. Univ. Estadual Paulista, São Paulo, SP (Brazil)
2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
3. Univ. Federal de Santa Catarina, Florianópolis, SC (Brazil); Univ. of Colorado, Boulder, CO (United States)

Correlations and fluctuations of physical quantities are known to play an important role in phase transitions and critical phenomena. In recent years some experimental attempts were made in the scope of the Beam Energy Scan program to locate a possible critical point in the QCD phase diagram. In this work we use the Nambu–Jona-Lasinio model to investigate the off-diagonal quark susceptibility, which is related to the quark–anti-quark scaled correlation at the mean field level. We show that this correlation has a significant peak near the critical point and, therefore, may be a useful quantity to measure in experiment. We further study the effects of a repulsive vector coupling, which reduces the strength of the scaled correlation near the critical point.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
• Grant/Contract Number: AC02-05CH11231
• OSTI ID: 1580998
• Alternate ID(s): OSTI ID: 1574082
• Journal Information: Nuclear Physics. A, Journal Name: Nuclear Physics. A Journal Issue: C Vol. 994; ISSN 0375-9474
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English