Speaker
Description
The dynamical core-corona initialization (DCCI) model [1] is a novel framework to describe the space-time evolution of both equilibrium (the core) and non-equilibrium (the corona) components in high-energy nuclear collisions in a unified mannter. The distinct feature of the DCCI model is to reproduce multiplicity dependence of the yield ratio between multi-strange hadrons and pions through a combination of the core and the corona components. This is crutial in describing the small multiplicity events such as p+p, p+A, and peripheral A+A collisions in which the local thermalization of the system is not expected to occur in the whole reaction region.
In this talk, I first show the fractions of the core and the corona components as functions of $dN_{\mathrm{ch}}/d\eta$ from the DCCI model and discuss that the core becomes dominant above $dN_{\mathrm{ch}}/d\eta \sim 20$ [1]. I next demonstrate the anomalous enhancement of the hadron yields in the very low $p_T$ region measured experimentaly could be interpreted as the corona components from fragmentation [2]. I also discuss dynamical initialization of the baryon number and its influence on the fluctuations of the baryon number density in the transverse plane at midrapidity [3].
[1] Y. Kanakubo et al., Phys. Rev. C 105, 024905 (2022).
[2] Y. Kanakubo et al., Phys. Rev. C 106, 054908 (2022).
[3] S. Fujii et al. (work in progress).
