May 22 – 28, 2011
Centre Bonlieu
Europe/Zurich timezone

Finite-size scaling search for the critical endpoint of QCD in heavy ion data

Not scheduled
Théâtre National (Centre Bonlieu)

Théâtre National

Centre Bonlieu

Board: 142
Poster QCD phase diagram


Eduardo Fraga (Universidade Federal do Rio de Janeiro)


Given the short lifetime and the reduced volume of the quark-gluon plasma (QGP) formed in high-energy heavy ion collisions, a possible critical endpoint (CEP) will be blurred over a region and the effects from criticality severely smoothened. Nevertheless, the non-monotonic behavior of correlation functions near criticality for systems of different sizes, given by different centralities in heavy ion collisions, must obey finite-size scaling. We apply the predicting power of scaling plots to the search for the CEP of strong interactions in heavy ion collisions using data from RHIC and SPS. The results of our data analysis suggest that a critical point cannot be below chemical potentials $\mu\sim 450~$MeV. Extrapolating the analysis, we speculate that criticality could appear slightly above $\mu\sim 500~$MeV. Using available data we extrapolate our scaling curves to predict the behavior of new data at lower center-of-mass energy, currently being investigated in the Beam Energy Scan program at RHIC.

Primary author

Eduardo Fraga (Universidade Federal do Rio de Janeiro)


Leticia Palhares (Institut de Physique Theorique, CEA/Saclay) Paul Sorensen (Brookhaven National Laboratory)

Presentation materials