Interplay between core and corona components in high-energy nuclear collisions

Understand

We establish the updated version of dynamical core--corona initialization framework (DCCI2) as a unified description from small to large colliding systems and from low to high transverse momentum ($p_T$) regions.

• Using DCCI2, we investigate effects of interplay between locally equilibrated and non-equilibrated systems, in other words, core and corona components in high-energy nuclear collisions.
• Given experimental multiplicity distributions and yield ratios of $\Omega$ baryons to charged pions as inputs, we extract the fraction of core and corona components in p+p collisions at $\sqrt{s}=7$ TeV and Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV.
• We find core contribution overtakes corona contribution as increasing multiplicity above $\langle dN_{\mathrm{ch}}/d\eta \rangle_{|\eta|<0.5} \sim 18$ regardless of the collision system or energy.