Speaker
Description
Short-lived hadronic resonances are very useful to probe the late-stage evolution of ultra-relativistic heavy-ion collisions. Since their lifetimes are comparable to the hadronic phase timespan, their measured yields are modified via rescattering and regeneration processes. The suppression of the K$^{*0}$/K ratio in central Pb--Pb collisions compared to pp interactions already hints at the dominance of rescattering effects over regeneration effects in the hadronic phase. The mass and lifetime of K$^{*\pm}$ are comparable to those of K$^{*0}$. Hence, systematic measurements of K$^{*0}$ and K$^{*\pm}$ enable us to investigate further the dynamics of the hadronic phase, to study its lifetime and to probe in-medium parton energy loss with high $p_{\mathrm{T}}$ resonances.
We report on the first measurement of K$^{*\pm}$ production in midrapidity for Pb--Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV. The results include the transverse momentum spectra, integrated yields, mean transverse momenta, particle ratios, and nuclear modification factor as a function of charged-particle multiplicity. These results will be compared with published K$^{*0}$ measurements at the same energy.
