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

We report the investigation of the kinetic freeze-out properties of identified hadrons (π^±, K^± and p(p̅)) along with light (anti-)nuclei d (d̅), t (t̅) and ^3He 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 () spectra of identified hadrons together with light (anti-)nuclei produced in collisions at = 7.7 – 200 GeV and in collisions at = 2.76. The energy and centrality dependence of kinetic freeze-out temperature (T_kin) and collective flow velocity ⟨β⟩ 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 the T_kin and a slight decrease in ⟨β⟩ when compared to the values obtained from the fit to light hadrons, indicating that heavier particles decouple earlier in time from the fireball compared to the light hadrons due to higher masses and are more sensitive to the effects of the radial flow. A similar ⟨β⟩ and significant larger T_kin is observed when fit is performed to only protons and light (anti-)nuclei. Additionally, we also observe that the T_kin increases from central to peripheral collisions, which is consistent with the argument of short-lived fireball in peripheral collisions. Whereas the ⟨β⟩ shows a decreasing trend from central to peripheral collisions indicating a more rapid expansion in the central collisions. Both, T_kin and ⟨β⟩ show a weak dependence on the collision energy at most energies. We also observe a strong anti-correlation between T_kin and ⟨β⟩.