Elliptic flow splittings in the Polyakov-looped Nambu-Jona Lasinio transport model

TL;DR

This paper extends the NJL transport model with Polyakov loops to include gluon effects and studies how weak quark vector interactions influence elliptic flow splittings in heavy-ion collisions, shedding light on the quark matter equation of state.

Contribution

The paper introduces a Polyakov-looped NJL transport model embedded in an extended AMPT framework to analyze elliptic flow splittings at RHIC-BES energies.

Findings

Weak quark vector interactions can explain proton-antiproton elliptic flow splittings.

The model provides insights into the quark matter equation of state at high baryon densities.

Results help locate the QCD critical point.

Abstract

To incorporate the effect of gluons on the evolution dynamics of the quark matter produced in relativistic heavy-ion collisions, we extend the 3-flavor Nambu-Jona-Lasinio (NJL) transport model to include the contribution from the Polyakov loops. Imbedding the resulting pNJL partonic transport model in an extended multiphase transport (extended AMPT) model, we then study the elliptic flow splittings between particles and their antiparticles in relativistic heavy-ion collisions at RHIC-BES energies. We find that a weak quark vector interaction in the partonic phase is able to describe the elliptic flow splitting between protons and antiprotons in heavy-ion collisions at $\sqrt{s_{NN}}=7.7$ to 39 GeV. Knowledge on the quark vector interaction is useful for understanding the equation of state of quark matter at large baryon chemical potentials and thus the location of the critical point in the QCD phase diagram.