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David Silvermyr

David Silvermyr

Senior lecturer

David Silvermyr

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

Author

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

Summary, in English

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.

Department/s

  • Particle and nuclear physics
  • eSSENCE: The e-Science Collaboration

Publishing year

2019

Language

English

Publication/Series

Physical Review Letters

Volume

123

Issue

19

Document type

Journal article

Publisher

American Physical Society

Topic

  • Subatomic Physics

Keywords

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

Status

Published

ISBN/ISSN/Other

  • ISSN: 1079-7114