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

TL;DR

This paper extends the AMPT model with coalescence factors to better describe the enhanced production of strange baryons across various collision systems and energies at RHIC and LHC.

Contribution

The paper introduces additional coalescence factors into the AMPT model, enabling it to accurately reproduce strangeness enhancement in diverse high-energy nuclear collisions.

Findings

Extended AMPT model matches experimental strangeness enhancement data.

Coalescence factors depend on system size, not collision type.

Model describes multiplicity dependence in small and large systems.

Abstract

We introduce additional coalescence factors for the production of strange baryons in a multiphase transport (AMPT) model in order to describe the enhanced production of multistrange hadrons observed in Pb-Pb collisions at $\rm \sqrt{s_{NN}}$ = 2.76 TeV at the Large hadron Collider (LHC) and Au+Au collisions at $\rm \sqrt{s_{NN}}$ = 200 GeV at Relativistic Heavy-Ion Collider (RHIC).This extended AMPT model is found to also give a reasonable description of the multiplicity dependence of the strangeness enhancement observed in high multiplicity events in $pp$ collisions at $\rm \sqrt{s}$ = 7 TeV and $p$-Pb collisions at $\rm \sqrt{s_{NN}}$ = 5.02 TeV. We find that the coalescence factors depend on the system size but not much on whether the system is produced from A+A or p+A collisions. The extended AMPT model thus provides a convenient way to model the mechanism underlying the observed strangeness enhancement in collisions of both small and large systems at RHIC and LHC energies.