Measurement of Υ(1S) Elliptic Flow at Forward Rapidity in Pb-Pb Collisions at √sNN=5.02  TeV

ALICE Collaboration, S Acharya, Jonatan Adolfsson, Peter Christiansen, Oliver Matonoha, Adrian Nassirpour, Anders Oskarsson, Tuva Richert, Omar Vazquez Rueda, David Silvermyr, Evert Stenlund, N Zurlo

Research output: Contribution to journalArticlepeer-review

Abstract

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 0 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
Article number192301
JournalPhysical Review Letters
Volume123
Issue number19
DOIs
Publication statusPublished - 2019

Subject classification (UKÄ)

  • Subatomic Physics

Free keywords

  • Atomic physics
  • Physics
  • Experimental evidence
  • Forward rapidity
  • Pb-Pb collisions
  • Positive value
  • Scalar product
  • Standard deviation
  • Transport models
  • Transverse momenta
  • Binary alloys

Fingerprint

Dive into the research topics of 'Measurement of Υ(1S) Elliptic Flow at Forward Rapidity in Pb-Pb Collisions at √sNN=5.02  TeV'. Together they form a unique fingerprint.

Cite this