Azimuthal Anisotropy of D${^0}$ Production in Pb–Pb Collisions

Abstract

The results on the azimuthal anisotropy of D meson production in Pb–Pb collisions at $\sqrt{s_\mathrm{NN}}=2.76$ TeV are presented in this chapter. The azimuthal anisotropy was quantified in terms of the elliptic flow $v_2$ and of the nuclear modification factor $R_\mathrm{AA}$, measured in the direction of the event plane and orthogonal to it. Section 7.1 is devoted to the $v_2$ results: the $\mathrm{D}^{0}$ elliptic flow is presented as a function of $p_\mathrm{T}$ in the 30–50 % centrality class. $v_2$ was also measured in the 0–10 % and 10–30 % centrality classes to investigate its dependence on the collision centrality. The average D meson elliptic flow is compared in this section with the charged-particle $v_2$ measured with the event-plane method. The results of the $\mathrm{D}^{0}$ $R_\mathrm{AA}$ measured in the in-plane and in the out-of-plane regions, in the 30–50 % centrality class, are presented in Sect. 7.3. Section 7.4 is devoted to the comparison of the average D meson $v_2$ in the 30–50 % centrality class, the average D meson nuclear modification factor in 0–20 % Pb–Pb collisions, and the $\mathrm{D}^{0}$ meson $R_\mathrm{AA}$ in-plane and out-of-plane to theoretical calculations.