# Transport Meeting

Venue: Physics Building, Max-von-Laue-Str. 1, PHYS 02.116
Time: Thursday, November 28, 2:15pm (s.t.)
Contact: hees@itp.uni-frankfurt.de

# Kinetic freeze-out temperature from yields of short-lived resonances

## Anton Motornenko

A method to determine the kinetic freeze-out temperature in heavy-ion collisions from measured yields of short-lived resonances is presented. The resonance production is treated in the framework of thermal model with an evolution between chemical and kinetic freeze-outs. The yields of many short-lived resonances are suppressed at $T = T_{\rm kin} < T_{\rm ch}$. A fit of $T_{\rm kin}$ allows to describe the abundances of both, the stable hadrons and the short-lived resonances, like $\rho^0$ and $\text{K}^{*0}$, as measured by the ALICE collaboration at the LHC as a function of  centrality. This allows to extract $T_{\rm kin}$ from the measured hadron and resonance yields alone, independent of assumptions about the flow velocity profile and the freeze-out hypersurface. The extracted $T_{\rm ch}$ values exhibit a moderate multiplicity dependence whereas $T_{\rm kin}$ drops, from $T_{\rm kin} \simeq T_{\rm ch} \simeq 155 \, \text{MeV}$ in peripheral collisions to $T_{\rm kin} \simeq 110 \, \text{MeV}$ in 0-20% central collisions. Predictions for other short-lived resonances are presented. A potential (non-)observation of a suppressed $\text{f}_0(980)$ meson yield will allow to constrain the lifetime of that meson.

The talk will be live-streamed (but not recorded) via Vidyo under
https://vc.uni-frankfurt.de/join/idcqq8I3y2FCW6p8DTQF9CTQJc

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