Two-particle angular correlations in pp and p-Pb collisions at LHC energies from a multi-phase transport model

TL;DR

This study uses a multi-phase transport model to analyze two-particle angular correlations in proton-proton and proton-lead collisions at LHC energies, improving understanding of particle production mechanisms.

Contribution

The paper introduces an enhanced AMPT model with a new quark coalescence mechanism that better reproduces baryon-baryon correlation features observed in experiments.

Findings

Improved description of baryon-baryon and antibaryon-antibaryon angular correlations.

Better reproduction of anti-correlation features with the new quark coalescence.

Consistent results in both pp and p-Pb collision analyses.

Abstract

We apply a multi-phase transport (AMPT) model to study two-particle angular correlations in $pp$ collisions at $\sqrt{s}= 7$ TeV. Besides being able to describe the angular correlation functions of meson-meson pairs, a large improvement for the angular correlations of baryon-baryon and antibaryon-antibaryon is achieved. We further find that the AMPT model with new quark coalescence provides an even better description on the anti-correlation feature of baryon-baryon correlations observed in the experiments. We also extend the study to p-Pb collisions at $\sqrt{s}= 5.02$ TeV and obtained similar results. These results help us better understand the particle production mechanism in $pp$ and p-Pb collisions at LHC energies.