Angular dihadron correlations as interplay of elliptic and triangular flows

TL;DR

This paper uses the HYDJET++ model to analyze how elliptic (v_2) and triangular (v_3) flow harmonics interact to produce the ridge structure in dihadron angular correlations in PbPb collisions at 2.76 TeV, comparing results with experimental data.

Contribution

It demonstrates that the ridge structure in dihadron correlations can result from the interplay of v_2 and v_3 flow harmonics using the HYDJET++ model.

Findings

The ridge arises from v_2 and v_3 interplay.

Model results agree with experimental data across centralities.

Flow harmonics influence dihadron correlation structures.

Abstract

The hybrid model HYDJET++, which combines soft and hard components, is employed for the analysis of dihadron angular correlations measured in PbPb collisions at center-of-mass energy sqrt(s_NN) = 2.76 TeV. The model allows for study both individual contributions and mutual influence of lower flow harmonics, v_2 and v_3, on higher harmonics and dihadron angular correlations. It is shown that the typical structure called ridge in dihadron angular correlations in a broad pseudorapidity range could appear just as interplay of v_2 and v_3. Central, semi-central and semi-peripheral collisions were investigated. Comparison of model results with the experimental data on dihadron angular correlations is presented for different centralities and transverse momenta p_T.