2014/08/26 by Didier Alexandre
Physics and Astronomy · #Baryon #Hadron #High-Energy Particle Collisions Research #Hyperon #Large Hadron Collider #Multiplicity (mathematics) #Nuclear physics #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Physics #Pion #Production (economics) #Proton #Quantum Chromodynamics and Particle Interactions #Strangeness #Strangeness production #Time projection chamber #hep-ex #nucl-ex
paper · pdf · doi:10.1016/j.nuclphysa.2014.08.060
openalex publication_date 2014/08/26 · arxiv created 2015/03/04 · openalex created_date 2016/06/24 · arxiv updated 2019/08/13 · openalex updated_date 2026/08/05
Multi-strange baryons are of particular interest in the understanding of particle production mechanisms, as their high strangeness content makes them susceptible to changes in the hadrochemistry of the colliding systems. In ALICE, these hyperons are reconstructed via the detection of their weak decay products, which are identified through their measured ionisation losses and momenta in the Time Projection Chamber. The production rates of charged Ξ and Ω baryons in proton-proton (pp), proton-lead (p-Pb) and lead-lead (Pb-Pb) collisions are reported as a function of pT. A direct comparison in the hyperon-to-pion ratios between the three collision systems is made as a function of event charged-particle multiplicity. The recently measured production rates in p-Pb interactions reveal an enhancement with increasing event multiplicity, consistent with a hierarchy dependent on the strangeness content of the hyperons. These results are discussed in the context of chemical equilibrium predictions, taking into account the extracted temperature parameter from a thermal model fit to the hadron yields in Pb-Pb data.