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Kinetic temperature and radial flow velocity estimation using identified hadrons and light (anti-)nuclei produced in relativistic heavy-ion collisions at RHIC and LHC (2403.02759v3)

Published 5 Mar 2024 in nucl-th and hep-ph

Abstract: We report the investigation of the kinetic freeze-out properties of identified hadrons ($\pi\pm$, $K\pm$ and $p(\bar p)$) along with light (anti-)nuclei $d (\bar d)$, $t (\bar t)$ and ${}{3}He$ in relativistic heavy-ion collisions at RHIC and LHC energies. A simultaneous fit is performed with the Blast-Wave (BW) model to the transverse momentum ({\ppt}) spectra of identified hadrons together with light (anti-)nuclei produced in $Au+Au$ collisions at {\sqrtsNN} = 7.7 -- 200 GeV at the RHIC and in $Pb+Pb$ collisions at $\sqrt{\mathrm{s}{{\mathrm{NN}}}}$ = 2.76 TeV at the LHC. The energy and centrality dependence of freeze-out parameters, i.e., kinetic freeze-out temperature ($T_{kin}$) and collective flow velocity $\langle \beta \rangle$ has been studied. It is observed that light (anti-)nuclei also participate in the collective expansion of the medium created in the collision when included in a common fit with the light hadrons. We observe a marginal rise in $T_{kin}$ and a slight decrease in $\langle \beta \rangle$ when compared to the values obtained from the fit to light hadrons. A similar $\langle \beta \rangle$ and significantly larger $T_{kin}$ is observed when a fit is performed to only protons and light (anti-)nuclei. Both, $T_{kin}$ and $\langle \beta \rangle$ show a weak energy dependence at most collision energies.

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