Measurement of the jet-particle $v_2$ in p--Pb and Pb--Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV with ALICE at the LHC

Abstract

The elliptic flow of jet particles at midrapidity ($|\eta |$ < 0.8) is measured for the first time in p--Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV and extended down to lower $p_{\mathrm{T}}$ in Pb--Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV. The jet particles are extracted with the two-particle correlation method using a two-dimensional fit, and their $v_2$ is calculated with the novel three-particle correlation technique. The $v_2$ of jet particles is found positive in high-multiplicity p--Pb collisions and exhibits no dependence on $p_{\mathrm{T}}$ within uncertainties. Comparisons with the jet-particle $v_2$ in Pb--Pb collisions and the inclusive charged-particle $v_2$ in both collision systems are also discussed, aiming to bring new insights into the understanding of the origin of the high-$p_{\mathrm{T}}$ azimuthal anisotropy observed in small collision systems.

6 pages, 5 figures, Proceedings of the European Physical Society Conference on High Energy Physics (EPS-HEP2021), submitted to PoS