Study of J/ψ azimuthal anisotropy at forward rapidity in Pb-Pb collisions at √sNN=5.02 TeV



Acharya, S, Acosta, FT, Adamova, D, Adler, A, Adolfsson, J, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z
et al (show 1009 more authors) (2019) Study of J/ψ azimuthal anisotropy at forward rapidity in Pb-Pb collisions at √sNN=5.02 TeV JOURNAL OF HIGH ENERGY PHYSICS, 2019 (2). 12-. ISSN 1126-6708, 1029-8479

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Abstract

The second (v<inf>2</inf>) and third (v<inf>3</inf>) flow harmonic coefficients of J/ψ mesons are measured at forward rapidity (2.5 < y < 4.0) in Pb-Pb collisions at sNN=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<inf>T</inf>, for various collision centralities. A positive value of J/ψ v<inf>3</inf> is observed with 3.7σ significance. The measurements, compared to those of prompt D<sup>0</sup> mesons and charged particles at mid-rapidity, indicate an ordering with v<inf>n</inf>(J/ψ) < v<inf>n</inf>(D<sup>0</sup>) < v<inf>n</inf>(h<sup>±</sup>) (n = 2, 3) at low and intermediate p<inf>T</inf> up to 6 GeV/c and a convergence with v<inf>2</inf>(J/ψ) ≈ v<inf>2</inf>(D<sup>0</sup>) ≈ v<inf>2</inf>(h<sup>±</sup>) at high p<inf>T</inf> above 6–8 GeV/c. In semi-central collisions (5–40% and 10–50% centrality intervals) at intermediate p<inf>T</inf> between 2 and 6 GeV/c, the ratio v<inf>3</inf>/v<inf>2</inf> of J/ψ mesons is found to be significantly lower (4.6σ) with respect to that of charged particles. In addition, the comparison to the prompt D<sup>0</sup>-meson ratio in the same p<inf>T</inf> interval suggests an ordering similar to that of the v<inf>2</inf> and v<inf>3</inf> coefficients. The J/ψ v<inf>2</inf> 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.

Item Type: Article
Uncontrolled Keywords: Hadron-Hadron scattering (experiments)
Depositing User: Symplectic Admin
Date Deposited: 20 May 2019 15:56
Last Modified: 22 May 2026 21:21
DOI: 10.1007/JHEP02(2019)012
Open Access URL: https://doi.org/10.1007/JHEP02(2019)012
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3042200
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