K*(892)± resonance production in Pb-Pb collisions at sNN=5.02 TeV


Acharya, S ORCID: 0000-0002-9213-5329, Adamová, D ORCID: 0000-0002-0504-7428, Aglieri Rinella, G ORCID: 0000-0002-9611-3696, Agnello, M ORCID: 0000-0002-0760-5075, Agrawal, N ORCID: 0000-0003-0348-9836, Ahammed, Z ORCID: 0000-0001-5241-7412, Ahmad, S ORCID: 0000-0003-0497-5705, Ahn, SU ORCID: 0000-0001-8847-489X, Ahuja, I ORCID: 0000-0002-4417-1392, Akindinov, A ORCID: 0000-0002-7388-3022 et al (show 1038 more authors) (2024) K*(892)± resonance production in Pb-Pb collisions at sNN=5.02 TeV Physical Review C, 109 (4). 044902-.

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Abstract

The production of K∗(892)± meson resonance is measured at midrapidity (|y|<0.5) in Pb-Pb collisions at sNN=5.02 TeV using the ALICE detector at the CERN Large Hadron Collider. The resonance is reconstructed via its hadronic decay channel K∗(892)±→KS0π±. The transverse momentum distributions are obtained for various centrality intervals in the pT range of 0.4-16 GeV/c. Measurements of integrated yields, mean transverse momenta, and particle yield ratios are reported and found to be consistent with previous ALICE measurements for K∗(892)0 within uncertainties. The pT-integrated yield ratio 2K∗(892)±/(K++K-) in central Pb-Pb collisions shows a significant suppression at a level of 9.3σ relative to pp collisions. Thermal model calculations result in an overprediction of the particle yield ratio. Although both hadron resonance gas in partial chemical equilibrium (HRG-PCE) and music + smash simulations consider the hadronic phase, only HRG-PCE accurately represents the measurements, whereas music + smash simulations tend to overpredict the particle yield ratio. These observations, along with the kinetic freeze-out temperatures extracted from the yields measured for light-flavored hadrons using the HRG-PCE model, indicate a finite hadronic phase lifetime, which decreases with increasing collision centrality percentile. The pT-differential yield ratios 2K∗(892)±/(K++K-) and 2K∗(892)±/(π++π-) are presented and compared with measurements in pp collisions at s=5.02 TeV. Both particle ratios are found to be suppressed by up to a factor of five at pT<2.0 GeV/c in central Pb-Pb collisions and are qualitatively consistent with expectations for rescattering effects in the hadronic phase. The nuclear modification factor (RAA) shows a smooth evolution with centrality and is found to be below unity at pT>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.

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 08 Aug 2024 15:57
Last Modified: 08 Aug 2024 15:57
DOI: 10.1103/physrevc.109.044902
Open Access URL: https://doi.org/10.1103/PhysRevC.109.044902
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3183496
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