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

Journal Article · · Physical Review. C
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The production of K * ( 892 ) ± meson resonance is measured at midrapidity ( | y | < 0.5 ) in Pb Pb collisions at s N N = 5.02 TeV using the ALICE detector at the CERN Large Hadron Collider. The resonance is reconstructed via its hadronic decay channel K * ( 892 ) ± K S 0 π ± . The transverse momentum distributions are obtained for various centrality intervals in the p T 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 p T -integrated yield ratio 2 K * ( 892 ) ± / ( K + + K ) in central Pb Pb collisions shows a significant suppression at a level of 9.3 σ relative to p p 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 + simulations consider the hadronic phase, only HRG-PCE accurately represents the measurements, whereas + 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 p T -differential yield ratios 2 K * ( 892 ) ± / ( K + + K ) and 2 K * ( 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 p T < 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 ( R AA ) shows a smooth evolution with centrality and is found to be below unity at p 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.

©2024 CERN, for the ALICE Collaboration 2024 CERN

Sponsoring Organization:
USDOE
OSTI ID:
2333049
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 4 Vol. 109; ISSN PRVCAN; ISSN 2469-9985
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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