Speaker
Description
One of the important findings in small colliding systems at the LHC energies is that yields of (multi-)strange hadrons enhance more rapidly than those of charged pions as functions of multiplicity. To interpret this, we develop a dynamical initialization model with core-corona picture in hydrodynamic models. We generate the initial partons using some event generator. We put them in the source terms of relativistic hydrodynamic equations to generate the QGP fluids. Some of the initial partons with high pT or those isolated from the others are able to survive after dynamical initialization and form a hadronic string to decay into hadrons. Thus, in this framework, final hadrons come from either chemically equilibrated fluids (core) or string fragmentation (corona). By using this model, we reasonably reproduce the yield ratio of (multi-)strange hadrons to charged pions as a function of multiplicity observed by the ALICE Collaboration. We claim that hydrodynamic analysis of experimental data requires this kind of core-corona picture for better understanding of the whole reaction process of high-energy nuclear collisions.
