Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-11-29
Phys. Rev. D 85, 034027 (2012)
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 11 figures. Final PRD version (references and one more equation added)
Scientific paper
10.1103/PhysRevD.85.034027
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.
Schaefer Bernd-Jochen
Wagner Mathias
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