The centrality dependence of strange (K 0 S , + ) and multistrange ( −+ +, −+ +) hadron production is measured by ALICE in the Large Hadron Collider (LHC) lead-lead (Pb-Pb) collisions at a center-of-mass energy per nucleon pair √sNN = 5.02 TeV, using the full dataset collected during the LHC Run 2 campaign in the years 2015 and 2018. This is the largest heavy-ion dataset analyzed to date at the LHC, and it allows for the extraction of transverse momentum (pT ) spectra and pT -integrated yields with unprecedented precision, over a broad range of charged particle multiplicity densities (〈dNch/dη〉|η|<0.5), probing regions where smaller collision system (pp and p-Pb) results are also available. The pT spectra evolve with centrality, featuring higher 〈pT 〉 in central events for all particles. The /K 0 S ratio exhibits the distinctive baryon-to-meson enhancement in the intermediate pT region, with a maximum which is shifted to larger pT for more central collisions. The hadron-to-pion yield ratios are presented as a function of 〈dNch/dη〉|η|<0.5 and compared to results from different collision systems and energies. A smooth connection from pp to Pb-Pb is observed, thus demonstrating that collision system or energy do not play a role in the multiplicity evolution of this observable. The previously reported enhancement of strangeness production in the multiplicity range probed in pp and p-Pb collisions saturates in the multiplicity range of Pb-Pb data. These results constitute a key test bench for theoretical models and a first comparison to the EPOS 4 generator is presented.

Centrality dependence of strange particle production in Pb-Pb collisions at sNN=5.02 TeV / Abualrob, I.J., Acharya, S., Aglieri Rinella, G., Aglietta, L., Agrawal, N., Ahammed, Z., Ahmad, S., Ahuja, I., Akbar, Z., Akindinov, A., Akishina, V., Al-Turany, M., Aleksandrov, D., Alessandro, B., Alfaro Molina, R., Ali, B., Alici, A., Alkin, A., Alme, J., Alocco, G., et al.. - In: PHYSICAL REVIEW C. - ISSN 2469-9985. - 114:2(2026). [10.1103/j21y-pqd6]

Centrality dependence of strange particle production in Pb-Pb collisions at sNN=5.02 TeV

Bufalino, S.;Di Costanzo, M.;Follo, U.;Gioachin, G.;
2026

Abstract

The centrality dependence of strange (K 0 S , + ) and multistrange ( −+ +, −+ +) hadron production is measured by ALICE in the Large Hadron Collider (LHC) lead-lead (Pb-Pb) collisions at a center-of-mass energy per nucleon pair √sNN = 5.02 TeV, using the full dataset collected during the LHC Run 2 campaign in the years 2015 and 2018. This is the largest heavy-ion dataset analyzed to date at the LHC, and it allows for the extraction of transverse momentum (pT ) spectra and pT -integrated yields with unprecedented precision, over a broad range of charged particle multiplicity densities (〈dNch/dη〉|η|<0.5), probing regions where smaller collision system (pp and p-Pb) results are also available. The pT spectra evolve with centrality, featuring higher 〈pT 〉 in central events for all particles. The /K 0 S ratio exhibits the distinctive baryon-to-meson enhancement in the intermediate pT region, with a maximum which is shifted to larger pT for more central collisions. The hadron-to-pion yield ratios are presented as a function of 〈dNch/dη〉|η|<0.5 and compared to results from different collision systems and energies. A smooth connection from pp to Pb-Pb is observed, thus demonstrating that collision system or energy do not play a role in the multiplicity evolution of this observable. The previously reported enhancement of strangeness production in the multiplicity range probed in pp and p-Pb collisions saturates in the multiplicity range of Pb-Pb data. These results constitute a key test bench for theoretical models and a first comparison to the EPOS 4 generator is presented.
2026
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/3016111