The QCD Phase Diagram from the Lattice

Szabolcs Borsanyi (), Zoltan Fodor, Jana Günther, Sandor D. Katz, Attila Pasztor, Israel P. Vazquez, Claudia Ratti and K. K. Szabó
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Szabolcs Borsanyi: Wuppertal University, Department of Physics
Zoltan Fodor: Wuppertal University, Department of Physics
Jana Günther: University of Regensburg, Department of Physics
Sandor D. Katz: Eötvös University, Institute for Theoretical Physics
Attila Pasztor: Wuppertal University, Department of Physics
Israel P. Vazquez: University of Houston, Department of Physics
Claudia Ratti: University of Houston, Department of Physics
K. K. Szabó: Wuppertal University, Department of Physics

A chapter in High Performance Computing in Science and Engineering ' 18, 2019, pp 75-88 from Springer

Abstract: Abstract We calculate several diagonal and non-diagonal fluctuations of conserved charges in a system of $$2+1+1$$ quark flavors with physical masses, on a lattice with size $$48^3\times 12$$ . Higher order fluctuations at $$\mu _B=0$$ are obtained as derivatives of the lower order ones, simulated at imaginary chemical potential. From these correlations and fluctuations we construct ratios of net-baryon number cumulants as functions of temperature and chemical potential, which satisfy the experimental conditions of strangeness neutrality and proton/baryon ratio. Our results qualitatively explain the behavior of the measured cumulant ratios by the STAR collaboration. We explain the obtained simulation results with a simple model, and find consistent behaviour with a scenario with no nearby critical end point in the QCD phase diagram.

Date: 2019
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Persistent link: https://EconPapers.repec.org/RePEc:spr:sprchp:978-3-030-13325-2_5

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DOI: 10.1007/978-3-030-13325-2_5

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