K${}^{\ast }$(892)${}^{\pm }$ resonance production in Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV

Abstract

The production of K${}^{\ast }$(892)${}^{\pm }$ meson resonance is measured at midrapidity ($|y|<0.5$) in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV using the ALICE detector at the LHC. The resonance is reconstructed via its hadronic decay channel K${}^{\ast }$(892)${}^{\pm }\to {\mathrm{K}}_{\mathrm{S}}^0{\pi }^{\pm }$. The transverse momentum distributions are obtained for various centrality intervals in the $p_{\mathrm{T}}$ range of 0.4-16 GeV/$c$. The reported measurements of integrated yields, mean transverse momenta, and particle yield ratios are consistent with previous ALICE measurements for K${}^{\ast }$(892)${}^0$. The $p_{\mathrm{T}}$-integrated yield ratio 2K${}^{\ast }$(892)${}^{\pm }$/(${\mathrm{K}}^{+}+{\mathrm{K}}^{-}$) in central Pb-Pb collisions shows a significant suppression (9.3$\sigma$) relative to pp collisions. Thermal model calculations overpredict the particle yield ratio. Although both simulations consider the hadronic phase, only HRG-PCE accurately represents the measurements, whereas MUSIC+SMASH tends to overpredict them. These observations, along with the kinetic freeze-out temperatures extracted from the yields of light-flavored hadrons using the HRG-PCE model, indicate a finite hadronic phase lifetime, which increases towards central collisions. The $p_{\mathrm{T}}$-differential yield ratios 2K${}^{\ast }$(892)${}^{\pm }$/(${\mathrm{K}}^{+}+{\mathrm{K}}^{-}$) and 2K${}^{\ast }$(892)${}^{\pm }$/(${\pi }^{+}+{\pi }^{-}$) are suppressed by up to a factor of five at $p_{\mathrm{T}}<2$ GeV/$c$ in central Pb-Pb collisions compared to pp collisions at $\sqrt{s}=$ 5.02 TeV. Both particle ratios and are qualitatively consistent with expectations for rescattering effects in the hadronic phase. The nuclear modification factor shows a smooth evolution with centrality and is below unity at $p_{\mathrm{T}}>8$ GeV/$c$, consistent with measurements for other light-flavored hadrons. The smallest values are observed in most central collisions, indicating larger energy loss of partons traversing the dense medium.

arXiv comment28 pages, 8 captioned figures, 3 tables, authors from page 22, published version, figures at http://alice-publications.web.cern.ch/node/9596

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