Signals of the QCD Critical Point in Hydrodynamic Evolutions

The presence of a critical point in the QCD phase diagram can deform the trajectories describing the evolution of the expanding fireball in the μB−T phase diagram. The deformation of the hydrodynamic trajectories will change the transverse velocity (βT) dependence of the proton-antiproton ratio when the fireball passes in the vicinity of the critical point. An unusual βT dependence of the ratio in a narrow beam energy window would thus signal the presence of the critical point.