# A new two-component model for hadron production in heavy-ion collisions

## TL;DR

This paper introduces a new two-component model for hadron production in heavy-ion collisions, addressing limitations of previous models by incorporating collective motion effects to better fit experimental spectra across all centralities.

## Contribution

A novel two-component distribution model that extends the generalized Fokker-Planck solution with hydrodynamic effects, improving the description of particle spectra in heavy-ion collisions.

## Key findings

- The new model successfully fits the entire $p_T$ spectra for pions, kaons, and protons.
- Previous models like double-Tsallis and generalized FP fail to describe the spectra simultaneously.
- Particle production mechanisms may differ across particle types and $p_T$ regions.

## Abstract

Using the experimental data from the ALICE program on the centrality dependence of the transverse momentum ($p_T$) spectra in Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV, we show that the double-Tsallis distribution and the generalized Fokker-Plank (FP) solution can not describe the spectra of pions, kaons and protons from central to peripheral collisions in the entire $p_T$ region, simultaneously. Hence, a new two-component distribution, which is a hydrodynamic extension of the generalized FP solution accounting for the collective motion effect in heavy-ion collisions, is proposed in order to reproduce all the particle spectra. Our results suggest that the particle production dynamics may be different for different particles, especially at very low $p_T$ region.