Speaker
Description
Hard probes as heavy quarks (charm and beauty) and jets are valuable tools for investigating the properties of the quark-gluon plasma (QGP) formed in ultra-relativistic heavy-ion collisions. In particular, measurements of the nuclear modification factor $R_{\rm AA}$ of these probes allow us to characterise the in-medium energy loss of heavy quarks, light quarks and gluons while traversing the QGP, and to shed light on the jet-quenching phenomenology. Information on the heavy-quark diffusion and degree of participation in the medium collective motion can be obtained by measuring the elliptic-flow coefficient $v_2$ of heavy-flavour particles. Similarly, measurements of jets yield correlation with the event-plane orientation allow us to study the path-length dependence of jet energy loss due to quenching. Complementary insights into heavy-quark fragmentation and energy redistribution in the QGP can be obtained by measuring angular correlations involving heavy-flavour particles.
In this contribution, the newly published results on the non-prompt $v_2$ coefficient of ${\rm D}^0$ mesons in Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV will be shown and compared to measurements of prompt D-meson $v_2$ in the same system. The recent final results of the heavy-flavour decay electron $R_{\rm AA}$ in Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV will also be reported, together with measurements of prompt and non-prompt D mesons and $\Lambda_{\rm c}^+$ baryons. New results of angular correlations of heavy-flavour decay electrons with charged particles in the same collision system will also be discussed.
Measurements of the inclusive charged-particle jet yield in central Pb--Pb collisions, with the large uncorrelated background mitigated using a novel event mixing technique, will also be reported. In addition to explorations of the low-$p_{\rm T}$ frontier, the inclusive charged-particle jet $v_2$ in semi-central Pb--Pb collisions will be shown, quantifying the yield dependence relative to the event-plane orientation and probing the path-length dependence of jet energy loss. More differential measurements of this azimuthal dependence, obtained by using event-shape engineering to select specific event topologies, and the jet substructure observable $R_{\rm g}$ to select specific jet topologies, will be discussed. Such measurements improve our understanding of how jet suppression depends on both medium and jet properties.
| Collaboration / Activity | ALICE |
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