Signature of QCD critical point: Anomalous transverse velocity dependence of antiproton-proton ratio

We formulate the QCD critical point focusing effect on transverse velocity (βt) dependence of antiproton to proton (p¯/p) ratio, which was recently proposed by Asakawa et al. as an experimental signature of QCD critical point in high energy heavy ion collisions (HICs). For quantitative analysis, Ultra-relativistic Quantum Molecular Dynamics (UrQMD) transport model and THERMal heavy-IoN generATOR (THERMINATOR) are applied to calculate the corresponding βt dependence of p¯/p ratio for three gedanken focused isentropic trajectories with different focusing degree on QCD phase diagram. Finally, we obtained an observable anomaly in βt dependence of p¯/p ratio, which can be employed as a signature of QCD critical point.