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arXiv · 1111.6871

QCD critical region and higher moments for three flavor models

Bernd-Jochen Schaefer·Mathias Wagner
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Abstract

One of the distinctive feature of the QCD phase diagram is the possible emergence of a critical endpoint. The critical region around the critical point and the path dependency of the critical exponents is investigated within effective chiral (2+1)-flavor models with and without Polyakov-loops. Results obtained in no-sea mean-field approximations where a divergent vacuum part in the fermion-loop contribution is neglected, are confronted to the renormalized ones. Furthermore, the modifications caused by the back-reaction of the matter fluctuations on the pure Yang-Mills system are discussed. Higher order, non-Gaussian moments of event-by-event distributions of various particle multiplicities are enhanced near the critical point and could serve as a probe to determine its location in the phase diagram. By means of a novel derivative technique higher order generalized quark-number susceptibilities are calculated and their sign structure in the phase diagram is analyzed.

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Bernd-Jochen Schaefer, Mathias Wagner. 2012-02-15. QCD critical region and higher moments for three flavor models. https://doi.org/10.1103/physrevd.85.034027

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