Study of $R_{\mathrm{AA}}$ and $v_2$ of non-strange D mesons and D-jet production in Pb-Pb collisions with ALICE

Abstract

Heavy quarks are sensitive probes of the colour-deconfined medium formed in ultra-relativistic heavy-ion collisions, the Quark-Gluon Plasma (QGP). The ALICE Collaboration measured the production of ${\mathrm{D}}^0$, ${\mathrm{D}}^{+}$, and ${\mathrm{D}}^{\ast +}$ mesons in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV. The properties of the in-medium energy loss are investigated via the measurement of the nuclear modification factor ($R_{\mathrm{AA}}$) of non-strange D mesons. The modification of the D-meson transverse momentum ($p_{\mathrm{T}}$) distributions inside the jet is studied via the measurement of the D-meson tagged jet $R_{\mathrm{AA}}$ in central Pb-Pb collisions. In mid-central collisions, the measurement of the D-meson elliptic flow ($v_2$) at low and intermediate $p_{\mathrm{T}}$ gives insight into the participation of the charm quark in the collective motion of the system, while at high $p_{\mathrm{T}}$ it constrains the path-length dependence of the energy loss. The coupling of the charm quark to the light quarks in the underlying medium is further investigated with the application of the event-shape engineering (ESE) technique to D-meson elliptic flow.

6 pages, 3 figures

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