# Charge correlations using balance functions of identified particles in Pb-Pb collisions at $\sqrt{s_{NN}} = 2.76$ TeV with ALICE

## TL;DR

This study analyzes charge balance functions of identified particles in Pb-Pb collisions at 2.76 TeV to investigate the chemical evolution and radial flow of the Quark-Gluon Plasma, revealing narrower balance functions in central collisions.

## Contribution

First measurement of balance functions for identified charged pions in Pb-Pb collisions at LHC energies, linking them to delayed hadronisation and radial flow effects.

## Key findings

- Balance function widths decrease in central collisions.
- Results support delayed hadronisation hypothesis.
- Findings consistent with radial flow effects.

## Abstract

By studying the balance functions of several hadronic species, one can gain insight into the chem-ical evolution of the Quark \textendash Gluon Plasma and radial flow. In a picture of early hadronisation,pairs of particles and anti-particles (created at the same space \textendash time point) are separated furtherin rapidity due to the higher initial temperature and diffusive interactions with other particles.Therefore delayed hadronisation will lead to strong correlations in rapidity in the final state. In this work, balance functions for identified charged-pion pairs measured by the ALICE detector atthe Large Hadron Collider (LHC) in Pb \textendash Pb collisions at \sqrt{s_{NN}} = 2.76 TeV are presented. These balance functions are presented in relative rapidity (\Delta y) and relative azimuthal angle (\Delta \varphi). It isobserved that the charged-pion balance function widths in \Delta y and \Delta \varphi get narrower in central Pb \textendash Pb collisions compared to peripheral collisions. The findings in this analysis are consistent withthe effects of delayed hadronisation and radial flow.