https://doi.org/10.1140/epjc/s10052-017-4784-y
Regular Article - Theoretical Physics
Baryon number fluctuations in quasi-particle model
1
Department of Foundation, Southeast University Chengxian College, Nanjing, 210088, China
2
Key Laboratory of Quark and Lepton Physics (MOE), Institute of Particle Physics, Central China Normal University, Wuhan, 430079, China
3
Department of Physics, Nanjing University, Nanjing, 210093, China
4
Joint Center for Particle, Nuclear Physics and Cosmology, Nanjing, 210093, China
5
State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, CAS, Beijing, 100190, China
* e-mail: xfluo@mail.ccnu.edu.cn
Received:
7
September
2016
Accepted:
23
March
2017
Published online:
1
April
2017
Baryon number fluctuations are sensitive to the QCD phase transition and the QCD critical point. According to the Feynman rules of finite-temperature field theory, we calculated various order moments and cumulants of the baryon number distributions in the quasi-particle model of the quark–gluon plasma. Furthermore, we compared our results with the experimental data measured by the STAR experiment at RHIC. It is found that the experimental data can be well described by the model for the colliding energies above 30 GeV and show large discrepancies at low energies. This puts a new constraint on the qQGP model and also provides a baseline for the QCD critical point search in heavy-ion collisions at low energies.
© The Author(s), 2017
