Has the QCD critical point been observed at RHIC?

2016/07/04 by Antoniou, N. G., Davis, N., Diakonos, F. K.
#FOS: Physical sciences #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th)

paper · doi:10.48550/arxiv.1607.01326

Abstract

The experimental search for the location of the QCD critical point in the phase diagram is of primary importance. In a recent publication it is claimed that measurements at RHIC lead not only to the location of the critical point (μ_cep=95 MeV, T_cep=165 MeV) but also to the verification of its universality class (3d Ising system) by extracting the values of the critical exponents (γ=1.2, ν=0.66). We argue that this claim is based on an erroneous treatment of scaling relations near the critical point. As a result, the correct interpretation of the measurements cannot be linked to the QCD critical point.

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