Yield ratio of hypertriton to light nuclei in heavy-ion collisions from $\rm \sqrt{s_{NN}}$ = 4.9 GeV to 2.76 TeV

Abstract

We resolve the difference in the yield ratio S 3 = N 3 Λ H /N Λ N 3 He /Np measured in Au+Au collisions at √ s NN = 200 GeV and in Pb-Pb collisions at √ s NN = 2.76 TeV by adopting a different treatment of the weak decay contribution to the proton yield in Au+Au collisions at √ s NN = 200 GeV. We then use the coalescence model to extract information on the Λ and nucleon density fluctuations at the kinetic freeze-out of heavy ion collisions. We also show from available experimental data that the yield ratio S 2 = N 3 Λ HN Λ N d is a more promising observable than S 3 for probing the local baryon-strangeness correlation in the produced medium.

Enhanced production of strange baryons in high-energy nuclear collisions from a multiphase transport model

“…We find that the coalescence factors depend on the system size but not much on where the system is produced from, and using multiplicity-dependent coalescence factors improves the description of the centrality dependence of particle production in Au + Au collisions. The current study provides a convenient way to model the mechanism underlying the strangeness enhancement observed in both small and large systems from nuclear collisions at the LHC, and it could also be relevant for the study of the QCD phase diagram in the Beam Energy Scan Program at RHIC via strange baryon production [48,49].…”