Fluctuations and correlations of baryonic chiral partners

Abstract

Fluctuations and correlations of the net-baryon number play an important role in exploring critical phenomena in phase transitions of strongly interacting matter governed by Quantum chromodynamics (QCD). In this work, we use the parity doublet model to investigate the fluctuations of the net-baryon number density in hot and dense hadronic matter. The model accounts for chiral criticality within the mean-field approximation. We focus on the qualitative properties and systematics of the first- and second-order susceptibility of the net-baryon number density, and their ratios for nucleons of positive and negative parity, as well as their correlator. We show that the fluctuations of the positive-parity nucleon do not necessarily reflect the fluctuations of the total net-baryon number density at the phase boundary of the chiral phase transition. We also investigate the non-trivial structure of the correlator. Furthermore, we discuss and quantify the differences between the fluctuations of the net-baryon number density in the vicinity of the chiral and liquid-gas phase transition in nuclear matter. We indicate a possible relevance of our results with the interpretation of the experimental data on net-proton number fluctuations in heavy-ion collisions.

Matches published version

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Cited by in corpus (7)

• Anatomy of critical fluctuations in hadronic matter
• Probing nuclear liquid-gas phase transition with isospin correlations
• Emergent chirality and superfluidity of parity-doubled baryons in neutron stars
• Bubble dynamics in the Polyakov quark-meson model
• Finite size effects on the phase diagram and the baryon fluctuations via momentum space constraints
• Renormalization-Group Invariant Parity-Doublet Model for Nuclear and Neutron-Star Matter
• Parity-doubled nucleons can rapidly cool neutron stars