Bazavov, A. and Bhattacharya, Tanmoy and De Tar, C. E. and Ding, H-T and Gottlieb, Steven and Gupta, Rajan and Hegde, P. and Heller, Urs M. and Karsch, F. and Laermann, E. and Levkova, L. and Mukherjee, Swagato and Petreczky, P. and Schmidt, Christian and Soltz, R. A. and Soeldner, W. and Sugar, R. and Vranas, Pavlos M. (2012) Fluctuations and correlations of net baryon number, electric charge, and strangeness: A comparison of lattice QCD results with the hadron resonance gas model. PHYSICAL REVIEW D, 86 (3): 034509. ISSN 2470-0010, 2470-0029
Full text not available from this repository.Abstract
We calculate the quadratic fluctuations of net baryon number, electric charge and strangeness as well as correlations among these conserved charges in (2 + 1)-flavor lattice QCD at zero chemical potential. Results are obtained using calculations with tree-level improved gauge and the highly improved staggered quark actions with almost physical light and strange quark masses at three different values of the lattice cutoff. Our choice of parameters corresponds to a value of 160 MeV for the lightest pseudoscalar Goldstone mass and a physical value of the kaon mass. The three diagonal charge susceptibilities and the correlations among conserved charges have been extrapolated to the continuum limit in the temperature interval 150 MeV <= T <= 250 MeV. We compare our results with the hadron resonance gas (HRG) model calculations and find agreement with HRG model results only for temperatures T less than or similar to 150 MeV. We observe significant deviations in the temperature range 160 MeV less than or similar to T less than or similar to 170 MeV and qualitative differences in the behavior of the three conserved charge sectors. At T similar or equal to 160 MeV quadratic net baryon number fluctuations in QCD agree with HRG model calculations, while the net electric charge fluctuations in QCD are about 10% smaller and net strangeness fluctuations are about 20% larger. These findings are relevant to the discussion of freeze-out conditions in relativistic heavy ion collisions.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | HEAVY-ION COLLISIONS; PHASE-TRANSITION; FREEZE-OUT; TEMPERATURE; DENSITY; THERMODYNAMICS; RESTORATION; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Gunnar Bali |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 07 May 2020 05:23 |
| Last Modified: | 07 May 2020 05:23 |
| URI: | https://pred.uni-regensburg.de/id/eprint/18270 |
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