Measurement of ϒ(1S) elliptic flow at forward rapidity in Pb–Pb collisions at √sNN = 5.02 TeV

ALICE Collaboration

Research output: Contribution to journalArticlepeer-review


The first measurement of the ϒ(1S) elliptic flow coefficient (v2) is performed at forward rapidity (2.5 < y < 4) in Pb–Pb collisions at √sNN = 5.02 TeV with the ALICE detector at the LHC. The results are obtained with the scalar product method and are reported as a function of transverse momentum (pT) up to 15 GeV/c in the 5–60% centrality interval. The measured ϒ(1S) v2 is consistent with zero and with the small positive values predicted by transport models within uncertainties. The v2 coefficient in 2 < pT < 15 GeV/c is lower than that of inclusive J/ψ mesons in the same pT interval by 2.6 standard deviations. These results, combined with earlier suppression measurements, are in agreement with a scenario in which the ϒ(1S) production in Pb–Pb collisions at LHC energies is dominated by dissociation limited to the early stage of the collision whereas in the J/ψ case there is substantial experimental evidence of an additional regeneration component.

Original languageEnglish (US)
JournalUnknown Journal
StatePublished - Jul 6 2019
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General

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