J/ψ elliptic and triangular flow in Pb-Pb collisions at √sNN=5.02 TeV



Acharya, S, Adamova, D, Adler, A, Adolfsson, J, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S
et al (show 997 more authors) (2020) J/ψ elliptic and triangular flow in Pb-Pb collisions at √sNN=5.02 TeV JOURNAL OF HIGH ENERGY PHYSICS, 2020 (10). 141-. ISSN 1126-6708, 1029-8479

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Abstract

The inclusive J/ψ elliptic (v<inf>2</inf>) and triangular (v<inf>3</inf>) flow coefficients measured at forward rapidity (2.5 < y < 4) and the v<inf>2</inf> measured at midrapidity (|y| < 0.9) in Pb-Pb collisions at sNN = 5.02 TeV using the ALICE detector at the LHC are reported. The entire Pb-Pb data sample collected during Run 2 is employed, amounting to an integrated luminosity of 750 μb<sup>−1</sup> at forward rapidity and 93 μb<sup>−1</sup> at midrapidity. The results are obtained using the scalar product method and are reported as a function of transverse momentum p<inf>T</inf> and collision centrality. At midrapidity, the J/ψ v<inf>2</inf> is in agreement with the forward rapidity measurement. The centrality averaged results indicate a positive J/ψ v<inf>3</inf> with a significance of more than 5σ at forward rapidity in the p<inf>T</inf> range 2 < p<inf>T</inf>< 5 GeV/c. The forward rapidity v<inf>2</inf>, v<inf>3</inf>, and v<inf>3</inf>/v<inf>2</inf> results at low and intermediate p<inf>T</inf> (p<inf>T</inf> ≲ 8 GeV/c) exhibit a mass hierarchy when compared to pions and D mesons, while converging into a species-independent curve at higher p<inf>T</inf>. At low and intermediate p<inf>T</inf>, the results could be interpreted in terms of a later thermalization of charm quarks compared to light quarks, while at high p<inf>T</inf>, path-length dependent effects seem to dominate. The J/ψ v<inf>2</inf> measurements are further compared to a microscopic transport model calculation. Using a simplified extension of the quark scaling approach involving both light and charm quark flow components, it is shown that the D-meson v<inf>n</inf> measurements can be described based on those for charged pions and J/ψ flow. [Figure not available: see fulltext.]

Item Type: Article
Uncontrolled Keywords: Hadron-Hadron scattering (experiments)
Divisions: Faculty of Science & Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 09 Sep 2021 15:11
Last Modified: 16 Jun 2026 13:19
DOI: 10.1007/JHEP10(2020)141
Open Access URL: https://link.springer.com/article/10.1007%2FJHEP10...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3136526
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