arXiv subjects

Ameng Zhao

Publications and source records attributed to Ameng Zhao.

3 recordsLinked to original sources

arXiv2021

Two Flavor Baryon Number Susceptibilities of Non-equilibrium State

In this paper, to be closer to the realities of the relativistic heavy ion collisions than the thermal equilibrium assumption often used in the calculations of baryon number susceptibilities, the creatures of the collisions are treated as isotropic systems with temperature gradient. In addition, the quarks are thought as the quasi-particles with thermal masses. By doing these and according to Boltzmann transport equation, we get our results of the experimental observables $Sσ$ and $κσ^2$. We found that the results show a gap in value and a centrality dependence, which might indicate the relation between the baryon number susceptibilities and the temperature gradient in QGP.

hep-ph↗

arXiv2021

Baryon Number Fluctuations in Two Flavor NJL Model

Baryon number fluctuations are believed to be good signatures of the QCD phase transition and its CP. Since the fluctuations are proportional to the various order baryon-number susceptibilities and the quark-number density is related to the dressed quark propagator, then by the two flavor NJL model we can calculate the moments of the up and down quarks. By comparing the two flavor NJL model results with the experimental data of $Sσ$ and $κσ^2$ for the net-proton distributions of Au+Au collisions by STAR, we found that the NJL results fit the experiments better at large collision energies and show an obvious fluctuation at small energies. And this fluctuation reflect that the two flavor NJL model is sensitive to the parameters of temperature $T$ and quark chemical potential $μ$ at small collision energies.

hep-ph↗

arXiv2017

Baryon Number Fluctuations in Quasi-particle Model

Baryon number fluctuations are sensitive to the QCD phase transition and 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 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. It can put new constraint on qQGP model and also provide a baseline for the QCD critical point search in heavy-ion collisions at low energies.

nucl-th↗