Strangeness neutrality and baryon-strangeness correlations

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Abstract

We derive a simple relation between strangeness neutrality and baryon-strangeness correlations. In heavy-ion collisions, the former is a consequence of quark number conservation of the strong interactions while the latter are sensitive probes of the character of QCD matter. This relation allows us to directly extract baryon-strangeness correlations from the strangeness chemical potential at strangeness neutrality. The explicit calculations are performed within a low-energy theory of QCD with 2+1 dynamical quark flavors at finite temperature and density. Nonperturbative quark and hadron fluctuations are taken into account within the functional renormalization group. The results show the pronounced sensitivity of baryon-strangeness correlations on the QCD phase transition and the crucial role that strangeness neutrality plays for this observable.

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Fu, W. J., Pawlowski, J. M., & Rennecke, F. (2019). Strangeness neutrality and baryon-strangeness correlations. Physical Review D, 100(11). https://doi.org/10.1103/PhysRevD.100.111501

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