Nature of particles azimuthal anisotropy at low and high transverse momenta in ultrarelativistic A+A collisions

TL;DR

This paper analyzes LHC Pb+Pb collision data using the HYDJET++ model to understand the origin of azimuthal anisotropy in particles at various transverse momenta, highlighting jet correlations in peripheral collisions.

Contribution

It demonstrates that correlations between low and high transverse momentum elliptic flow are primarily due to jet particle correlations, using a comprehensive model analysis.

Findings

Jet particle correlations explain $v_2$ correlations in peripheral collisions.

HYDJET++ effectively describes low and high $p_T$ regions.

The origin of $v_2$ at different $p_T$ is linked to soft and hard components.

Abstract

LHC data on the correlations of the elliptic flow $v_2$ of particles at low and high transverse momenta $p_T$ from Pb+Pb collisions at center-of-mass energy per nucleon pair $\sqrt{s_{NN}} = 5.02$ TeV are analyzed in the framework of the HYDJET++ model. This model includes soft and hard components which allows to describe the region of both low and high transverse momenta. The origin of $v_2$ values in different $p_T$ regions is investigated at different centralities. It is shown that the experimentally observed correlations between $v_2$ at low and high $p_T$ in peripheral lead-lead collisions is due to correlation of particles in jets.