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26 April 2024

» arxiv » 1710.3118

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The kurtosis of the chiral order parameter and its relevance for heavy-ion collisions
Christoph Herold ; Marcus Bleicher ; Marlene Nahrgang ; Jan Steinheimer ; Ayut Limphirat ; Chinorat Kobdaj ; Yupeng Yan ;
Date:	9 Oct 2017
Abstract:	We investigate higher cumulants of the sigma field as the chiral order parameter at the QCD phase transition. We derive a thermodynamic expression for the skewness and kurtosis from susceptibilities and use these to determine $Ssigma$ and $kappasigma^2$ for the sigma field in equilibrium. In a next step, we study the behavior of these cumulants in both an equilibrated static medium and an expanding medium resembling the hydrodynamic stage of a heavy-ion collision. For the latter one, we find a significant widening of the critical region.
Source:	arXiv, 1710.3118
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