Abstract
The main goal of the ALICE experiment is to study the properties of the hot and dense medium created in ultra-relativistic heavy-ion collisions. The measurement of the (multi-)strange particles is an important tool to understand particle production mechanisms and the dynamics of the quark-gluon plasma (QGP). We report on the production of in proton-lead (p–Pb) collisions at and lead-lead (Pb–Pb) collisions at measured by ALICE at the LHC. The comparison of the hyperon-to-pion ratios in the two colliding systems may provide insight into strangeness production mechanisms, while the comparison of the nuclear modification factors helps to determine the contribution of initial state effects and the suppression from strange quark energy loss in nuclear matter.
Highlights
Strangeness production has been extensively studied in relativistic heavy-ion collisions
In the context of Blast Wave model, it has been shown that spectra for K0S and Λ are well predicted using parameters from a simultaneous fit to π±, K± and p spectra in high multiplicity Pb–Pb and p–Pb collisions
This is true for Ξ and Ω in p–Pb collisions, while in Pb–Pb collisions they cannot be described in a common freeze-out scenario, as they would require a lower mean transverse flow velocity and a higher kinetic freezeout temperature to be described properly
Summary
Strangeness production has been extensively studied in relativistic heavy-ion collisions. The pT-differential (Λ+Λ)/K0S ratio is shown in Fig. 1 in the highest and a low-multiplicity class for p–Pb and Pb–Pb collisions. The nuclear modification factor is defined as the ratio of the pT spectra in Pb–Pb (RAA) or p–Pb (RpPb) and in pp collisions scaled by the number of nucleon-nucleon collisions.
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