Rapidity bin multiplicity correlations from a multi-phase transport model

TL;DR

This study uses a multi-phase transport model to analyze multiplicity correlations in Au+Au collisions across various energies, revealing energy-dependent patterns that probe the collision dynamics and evolution stages.

Contribution

It demonstrates how central-arbitrary bin multiplicity correlations vary with collision energy and evolution stages, offering a new probe for the dynamics of hot dense matter.

Findings

Correlations increase with pseudorapidity gap below 19.6 GeV

Correlations decrease with pseudorapidity gap above 19.6 GeV

Different responses of correlations to partonic and hadronic phases

Abstract

The central-arbitrary bin and forward-backward bin multiplicity correlation patterns for Au+Au collisions at $\sqrt{s_{NN}} $= $7.7-62.4$ GeV are investigated within a multi-phase transport (AMPT) model. An interesting observation is that for $\sqrt{s_{NN}} <19.6$ GeV Au+Au collisions, these two correlation patterns both have an increase with the pseudorapidity gap, while for $\sqrt{s_{NN}} >19.6$ GeV Au+Au collisions, they decrease. We mainly discuss the influence of different evolution stages of collision system on the central-arbitrary bin correlations, such as the initial conditions, partonic scatterings, hadronization scheme and hadronic scatterings. Our results show that the central-arbitrary bin multiplicity correlations have different responses to partonic phase and hadronic phase, which can be suggested as a good probe to explore the dynamical evolution mechanism of the hot dense matter in high-energy heavy-ion collisions.