K1/K* enhancement in heavy-ion collisions and the restoration of chiral symmetry

We extend the recent study of K₁/K* enhancement as a signature of chiral symmetry restoration in heavy ion collisions at the CERN Large Hadron Collider via the kinetic approach to include the effects due to nonunity hadron fugacities during the evolution of produced hadronic matter and the temperature-dependent K₁ mass. Although including nonunity pion and kaon fugacities reduces slightly the K₁/K* enhancement found in previous study due to chiral symmetry restoration, adding temperature-dependent K₁ mass leads to a substantial further reduction of the K₁/K* enhancement. However, the final K₁/K* ratio still shows a factor of 2.4 and 1.3 enhancement, respectively, in peripheral and midcentral collisions compared to the case without chiral symmetry restoration, confirming its use as a good signature for chiral symmetry restoration in the hot dense matter produced in relativistic heavy ion collisions.