$\eta'$ Production in Nucleus-Nucleus collisions as a probe of chiral dynamics

TL;DR

This paper proposes that $ abla$'s production in nucleus-nucleus collisions can serve as a sensitive indicator of chiral dynamics, especially through effects like gluon plasma rotation or topological susceptibility, which influence event geometry dependence.

Contribution

It introduces the idea that $ abla$'s yield variations can reveal chiral effects, highlighting the role of gluon plasma rotation and topological susceptibility in heavy-ion collisions.

Findings

Enhanced $ abla$ production may indicate chiral effects.

$ abla$/π^0 ratio depends on impact parameter and event geometry.

Potential to distinguish chiral dynamics from statistical models.

Abstract

We argue that, because of the peculiar properties of the $\eta'$ meson, it is a promising probe of "chiral" dynamics. In particular, we show that a rotating gluon-dominated plasma might lead to an enhanced production of $\eta'$ w.r.t. statistical model expectations. The presence of a strong topological susceptibility might give a similar effect. In both cases, unlike the statistical model,we expect a non-trivial dependence on event geometry, such as initial volume and impact parameter. Hence, an observation of $\eta'/\pi^0$ ratio depending strongly on impact parameter might be a good indication of chiral effects, either from vorticity or topological phases of QCD