Higher-order anisotropic flows and dihadron correlations in Pb-Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV in a multiphase transport model

TL;DR

This study uses a multiphase transport model to analyze higher-order anisotropic flows and dihadron correlations in Pb-Pb collisions at 2.76 TeV, reproducing experimental features such as the ridge and azimuthal correlations.

Contribution

It demonstrates that the multiphase transport model can effectively reproduce complex flow and correlation phenomena observed in heavy-ion collisions, with parameters fitted from prior experimental data.

Findings

Higher-order flows are well reproduced by the model.

Dihadron correlations exhibit ridge and broad structures similar to experiments.

Qualitative agreement with CMS dihadron correlation results.

Abstract

Using a multiphase transport model that includes both initial partonic and final hadronic scatterings, we have studied higher-order anisotropic flows as well as dihadron correlations as functions of pseudorapidity and azimuthal angular differences between trigger and associated particles in Pb-Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV. With parameters in the model determined previously from fitting the measured multiplicity density of mid-pseudorapidity charged particles in central collisions and their elliptic flow in mid-central collisions, the calculated higher-order anisotropic flows from the two-particle cumulant method reproduce approximately those measured by the ALICE Collaboration, except at small centralities where they are slightly overestimated. Similar to experimental results, the two-dimensional dihadron correlations at most central collisions show a ridge structure at the near side and a broad structure at the away side. The short- and long-range dihadron azimuthal correlations, corresponding to small and large pseudorapidity differences, respectively, are studied for triggering particles with different transverse momenta and are found to be qualitatively consistent with experimental results from the CMS Collaboration. The relation between the short-range and long-range dihadron correlations with that induced by back-to-back jet pairs produced from initial hard collisions is also discussed.