Higher cumulants of baryon number in critical QCD

We study the higher moments of the baryon number in the immediate neighbourhood of the QCD critical endpoint within the framework of Ising-QCD thermodynamics of a finite-size critical system (N. G. Antoniou et al., Phys. Rev. D 97, 034015, 2018). We show that the kurtosis, as a function of the freeze-out baryon chemical potential, becoming negative attains a sharp minimum very close to the critical point. We argue that the sharpness of this...