It is proposed that a study of the ratio of shear viscosity to entropy density sη as a function of the baryon chemical potential μB, and temperature T, provides a dynamic probe for the critical end point (CEP) in hot and dense QCD matter. An initial estimate from an elliptic flow excitation function gives μBcep∼150−180 MeV and Tcep∼165−170 MeV for the location of the the CEP. These values place the CEP in the range for "immediate" validation at RHIC.
@article{arxiv.0708.3512,
title = {An estimate for the location of QCD critical end point},
author = {Roy A. Lacey and N. N. Ajitanand and J. M. Alexander and P. Chung and J. Jia and A. Taranenko and P. Danielewicz},
journal= {arXiv preprint arXiv:0708.3512},
year = {2008}
}