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arXiv · 2110.00163

High-order baryon number fluctuations within the fRG approach

Wei-jie Fu·Xiaofeng Luo·Jan M. Pawlowski·Fabian Rennecke·Rui Wen·Shi Yin
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Abstract

We compute high-order baryon number fluctuations at finite temperature and density within a QCD-assisted low energy effective field theory. Quantum, thermal and density fluctuations are incorporated with the functional renormalization group approach. Quantum and in-medium fluctuations are encoded via the evolution of renormalization group flow equations. The resulting fourth- and sixth-order baryon number fluctuations meet the lattice benchmark results at vanishing density. They are consistent with experimental measurements, and in particular, the non-monotonic dependence of the kurtosis of net-baryon number distributions on the collision energy is observed in our calculations. This non-monotonicity arises from the increasingly sharpened chiral crossover with the decrease of collision energy.

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Wei-jie Fu, Xiaofeng Luo, Jan M. Pawlowski, Fabian Rennecke, Rui Wen, Shi Yin. 2021-10-01. High-order baryon number fluctuations within the fRG approach. https://arxiv.org/abs/2110.00163

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