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

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