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 483 × 12. Higher order fluctuations at μB = 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.
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Borsanyi, S., Fodor, Z., Guenther, J.N. et al. Higher order fluctuations and correlations of conserved charges from lattice QCD. J. High Energ. Phys. 2018, 205 (2018). https://doi.org/10.1007/JHEP10(2018)205
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DOI: https://doi.org/10.1007/JHEP10(2018)205