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