Strangeness enhancement at the LHC energies from dynamical core-corona initialization*

We study the enhancement of yields of strange and multi-strange baryons in small and large colliding systems. We previously proposed an idea of dynamically initializing hydrodynamic fields by utilizing source terms in hydrodynamic equations [1]. In this study, we further introduce the core-corona picture by considering spatial density of the initially produced partons. Under this idea, we calculate the ratios of strange hadron yields to charged pion yields as functions of multiplicity and compare our results with the ALICE data [2]. Our results describe the tendencies of increasing behavior of the ratios seen in ALICE data. From this analysis, we find the ALICE data indicate a continuous change of hadronization process from string fragmentation to particlization from fluids as a function of multiplicity.
[1] M.Okai, K.Kawaguchi, Y.Tachibana, T.Hirano, Phys. Rev. C 95, no. 5, 054914 (2017).
[2] J.Adam et al : (ALICE), Nature Phys. 13, 535 (2017).