Speaker
Description
The measurement of azimuthal correlations between two particles is a powerful tool to investigate the properties of strongly-interacting nuclear matter created in ultra-relativistic heavy-ion collisions. In particular, studying the near-and away-side hadron yields associated with trigger particles can provide important information to understand both the jet-medium interaction and hadron production mechanism. In this contribution, we present a study of two-particle correlations $\mathrm{V^{0}}$($\mathrm{K^{0}_{S}}$, $\Lambda/\overline{\Lambda}$) and charged hadrons as trigger particles of transverse momentum $8 < p_\mathrm{T,trig} < 16$ $\mathrm {GeV}/c$, and associated charged particles of $1$ $\mathrm{GeV}/c< p_\mathrm{T,assoc} < p_\mathrm{T,trig}$ at mid-rapidity in pp and Pb--Pb collisions at $\sqrt{s_{\rm{NN}}}$ $=5.02$ TeV recorded with the ALICE detector.
After subtracting the contributions of the flow background, the per-trigger yields are calculated on the near and away-side. The ratio of the per-trigger yields in Pb--Pb collisions with respect to pp collisions, $I_{\mathrm{AA}}$, is measured in the most central 0--10% collisions. A significant enhancement of $I_{\mathrm{AA}}$ for different particles species is observed at the lowest $p_\mathrm{T,assoc}$ on both near and away-side, while strong suppression of $I_{\mathrm{AA}}$ for $p_\mathrm{T,assoc}$ $>3$ $\mathrm{GeV}/c$ on away-side is observed as expected from strong in-medium energy loss. The data are compared to AMPT, HIJING and EPOS models. Most calculations, but HIJING, qualitatively describe the near-side and away-side yield modification at intermediate and high $p_\mathrm{T,assoc}$.
