  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.
