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Study of J/$\psi$ azimuthal anisotropy at forward rapidity in Pb-Pb collisions at $\sqrt{{\textit s}_{\rm NN}}$ = 5.02 TeV

The ALICE collaboration
JHEP, 2018

Abstract (data abstract)
CERN-LHC-ALICE. The second ($v_2$) and third ($v_3$) flow harmonic coefficients of J/$\psi$ mesons are measured at forward rapidity (2.5 $<$ $y$ $<$ 4.0) in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV with the ALICE detector at the LHC. Results are obtained with the scalar product method and reported as a function of transverse momentum, $p_{\rm T}$, for various collision centralities. A positive value of J/$\psi$ $v_3$ is observed with 3.7$\sigma$ significance. The measurements, compared to those of prompt D$^0$ mesons and charged particles at mid-rapidity, indicate an ordering with $v_{\rm n}$(J/$\psi$) $<v_{\rm n}$(D$^0$) $<v_{\rm n}$(h$^\pm$) (n = 2, 3) at low and intermediate $p_{\rm T}$ up to 6 GeV/$c$ and a convergence with $v_2$(J/$\psi$) $\approx v_2$(D$^0$) $\approx v_2$(h$^\pm$) at high $p_{\rm T}$ above 6-8 GeV/$c$. In semi-central collisions (5-40% and 10-50% centrality intervals) at intermediate $p_{\rm T}$ between 2 and 6 GeV/$c$, the ratio $v_3/v_2$ of J/$\psi$ mesons is found to be significantly lower (4.6$\sigma$) with respect to that of charged particles. In addition, the comparison to the prompt D$^0$-meson ratio in the same $p_{\rm T}$ interval suggests an ordering similar to that of the $v_2$ and $v_3$ coefficients. The J/$\psi$ $v_2$ coefficient is further studied using the Event Shape Engineering technique. The obtained results are found to be compatible with the expected variations of the eccentricity of the initial-state geometry.

  • Table 1

    Data from Figure 4

    10.17182/hepdata.88308.v1/t1

    The J/$\psi$ $v_2$ coefficient as a function of $p_{\rm T}$ in 0-10% centrality interval in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$...

  • Table 2

    Data from Figure 4

    10.17182/hepdata.88308.v1/t2

    The J/$\psi$ $v_2$ coefficient as a function of $p_{\rm T}$ in 10-30% centrality interval in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$...

  • Table 3

    Data from Figure 4

    10.17182/hepdata.88308.v1/t3

    The J/$\psi$ $v_2$ coefficient as a function of $p_{\rm T}$ in 30-50% centrality interval in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$...

  • Table 4

    Data from Figure 4

    10.17182/hepdata.88308.v1/t4

    The J/$\psi$ $v_3$ coefficient as a function of $p_{\rm T}$ in 0-10% centrality interval in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$...

  • Table 5

    Data from Figure 4

    10.17182/hepdata.88308.v1/t5

    The J/$\psi$ $v_3$ coefficient as a function of $p_{\rm T}$ in 10-30% centrality interval in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$...

  • Table 6

    Data from Figure 4

    10.17182/hepdata.88308.v1/t6

    The J/$\psi$ $v_3$ coefficient as a function of $p_{\rm T}$ in 30-50% centrality interval in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$...

  • Table 7

    Data from Figure 5

    10.17182/hepdata.88308.v1/t7

    The J/$\psi$ $v_3$ coefficient as a function of $p_{\rm T}$ in 0-50% centrality interval in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$...

  • Table 8

    Data from Figure 6

    10.17182/hepdata.88308.v1/t8

    The J/$\psi$ $v_3/v_2$ ratio as a function of $p_{\rm T}$ in 5-40% centrality interval in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$...

  • Table 9

    Data from Figure 6

    10.17182/hepdata.88308.v1/t9

    The J/$\psi$ $v_3/v_2$ ratio as a function of $p_{\rm T}$ in 10-50% centrality interval in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$...

  • Table 10

    Data from Figure 7

    10.17182/hepdata.88308.v1/t10

    The J/$\psi$ $v_2$ as a function of $p_{\rm T}$ for unbiased events (no event-shape selection) in the 5-40% centrality interval...

  • Table 11

    Data from Figure 7

    10.17182/hepdata.88308.v1/t11

    The J/$\psi$ $v_2$ as a function of $p_{\rm T}$ for lowest $q_2^{\rm V0A}$ event-shape class in the 5-40% centrality interval...

  • Table 12

    Data from Figure 7

    10.17182/hepdata.88308.v1/t12

    The J/$\psi$ $v_2$ as a function of $p_{\rm T}$ for highest $q_2^{\rm V0A}$ event-shape class in the 5-40% centrality interval...

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