Two-particle angular correlations of identified particles in pp and p--Pb collisions at LHC energies with ALICE

Abstract

The two-particle angular correlations in the $\Delta$y,$\Delta\varphi$ space provide valuable insights into the properties of hadronization mechanisms and quark-gluon plasma properties. The correlation functions are influenced by several physical sources, including mini-jet correlations, Bose-Einstein quantum statistics, resonance decays, conservation of energy and momentum, and other factors. Each correlation source has unique properties, and therefore each correlation function has a distinct form depending on transverse momentum and/or multiplicity. Previous results from angular correlation analysis of pp collisions at the LHC energies indicate an anticorrelation for pairs of baryons of the same sign in $\Delta\eta,\Delta\varphi$ space. This contradicts the predictions of Monte Carlo models, such as PYTHIA8 and EPOS. This study aims to investigate this behavior by exploring the correlation functions of different charge combinations of the detected particles (specifically, $\rm{\pi^{\pm}}$, $\rm{K^{\pm}}$, and $\rm{p}$$\bar{\rm{p}}$) and multiplicity classes in the $\Delta$y$,\Delta\varphi$ space for pp and p--Pb collisions at LHC energies. In addition, the study includes a comparison of the results obtained from both collision systems.