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K$^{*}$(892)$^{\pm}$ resonance production in Pb$-$Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV
The production of K$^*$(892)$^\pm$ meson resonance is measured at midrapidity ($|y|<0.5$) in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV using the ALICE detector at the LHC. The resonance is reconstructed via its hadronic decay channel K$^*$(892)$^\pm \rightarrow \rm{K^0_S π^\pm}$. The transverse momentum distributions are obtained for various centrality intervals in the $p_{\rm T}$ 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$^*$(892)$^0$. The $p_{\rm T}$-integrated yield ratio 2K$^*$(892)$^\pm$/($\rm{K^+ + K^-}$) in central Pb-Pb collisions shows a significant suppression (9.3$σ$) 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 $p_{\rm T}$-differential yield ratios 2K$^*$(892)$^\pm$/($\rm{K^+ + K^-}$) and 2K$^*$(892)$^\pm$/($\rm{π^+ + π^-}$) are suppressed by up to a factor of five at $p_{\rm T}<2$ 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 $p_{\rm T}>8$ 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.
28 pages, 8 captioned figures, 3 tables, authors from page 22, published version, figures at http://alice-publications.web.cern.ch/node/9596
- CEA LETI France
- Institut National de Physique Nucléaire et de Physique des Particules France
- Clermont Université France
- Clermont Université France
- Grenoble Alpes University France
ratio, model, thermal, heavy ion, scattering, momentum spectrum, GeV, thermal, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), ALICE, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], parton, freeze-out, Nuclear Experiment (nucl-ex), impact parameter, Nuclear Experiment, hadronic decay, lifetime, freeze-out, kinetic, suppression, K, heavy ion, p p, CERN LHC Coll, resonance, parton, energy loss, particle, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], energy loss, p p, scattering, kinetic, FOS: Physical sciences, transverse momentum, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], particle, yield, ratio, 530, freeze-out, temperature, transverse momentum, momentum spectrum, resonance, production, TeV, model, scattering, nucleus, temperature, meson resonance, particle, yield, yield, K, production, yield, ratio, production, hadron
ratio, model, thermal, heavy ion, scattering, momentum spectrum, GeV, thermal, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), ALICE, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], parton, freeze-out, Nuclear Experiment (nucl-ex), impact parameter, Nuclear Experiment, hadronic decay, lifetime, freeze-out, kinetic, suppression, K, heavy ion, p p, CERN LHC Coll, resonance, parton, energy loss, particle, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], energy loss, p p, scattering, kinetic, FOS: Physical sciences, transverse momentum, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], particle, yield, ratio, 530, freeze-out, temperature, transverse momentum, momentum spectrum, resonance, production, TeV, model, scattering, nucleus, temperature, meson resonance, particle, yield, yield, K, production, yield, ratio, production, hadron
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