Abstract

In order to study the hot hadronic matter created in heavy-ion collisions, it is important to compare particle production in large systems to that in smaller systems, such as proton-proton (pp) and proton-lead (p–Pb) collisions. In particular, resonances with different lifetimes are good candidates to probe the interplay of particle re-scattering and regeneration in the hadronic phase. The yields of the strange and double-strange hyperon resonances Σ(1385)± and Ξ(1530)0 are measured in the rapidity range −0.5 < yCMS < 0 in p–Pb collisions at with the ALICE detector at the LHC. We report on the transverse momentum distributions and mean transverse momentum as a function of the charged-particle multiplicity. These results complement the information derived from the measurements of other resonances such as K*(892)0 and ˚(1020). The multiplicity dependence of the integrated yield ratios of excited hyperons to longer-lived particles is discussed and compared to model predictions from pQCD-inspired models such as PYTHIA8 as well as statistical hadronization models.

Highlights

  • The measurement of resonances in ultra-relativistic heavy-ion collisions allows one to study the properties of the hadronic medium

  • The results show that the production of particles with short lifetime (Table 1), e.g. ρ(770)0 [1] and K*(892)0 [2], exhibits progressively larger suppression when going from pp to p–Pb and Pb–Pb collisions

  • The signals were reconstructed by invariant mass analysis of candidates for the decay products pairs from same events for various pT and multiplicity intervals

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Summary

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- Charmonium production in Pb-Pb collisions at $\sqrt{{s}_{{\rm{N}}{\rm{N}}}}=2.76\,{\rm{Te V}}$ and $\sqrt{{s}_{{\rm{N}}{\rm{N}}}}=5.02\,{\rm{Te V}}$ measured with ALICE at the LHC Benjamin Audurier and ALICE Collaboration.

Introduction
Published under licence by IOP Publishing Ltd
ALICE Preliminary
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