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

Acharya, S ; Adolfsson, Jonatan LU ; Christiansen, Peter LU ; Matonoha, Oliver LU ; Nassirpour, Adrian LU orcid ; Oskarsson, Anders LU ; Richert, Tuva LU ; Vazquez Rueda, Omar LU ; Silvermyr, David LU orcid and Stenlund, Evert LU , et al. (2019) In Physical Review Letters 123(19).
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... (More)
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. (Less)
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author collaboration
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Atomic physics, Physics, Experimental evidence, Forward rapidity, Pb-Pb collisions, Positive value, Scalar product, Standard deviation, Transport models, Transverse momenta, Binary alloys
in
Physical Review Letters
volume
123
issue
19
article number
192301
publisher
American Physical Society
external identifiers
  • scopus:85074896931
  • pmid:31765217
ISSN
1079-7114
DOI
10.1103/PhysRevLett.123.192301
language
English
LU publication?
yes
id
872b71e7-7a7d-4f2b-a79f-cac07e46538b
date added to LUP
2019-11-29 13:06:32
date last changed
2023-04-10 04:05:32
@article{872b71e7-7a7d-4f2b-a79f-cac07e46538b,
  abstract     = {{The first measurement of the Υ(1S) elliptic flow coefficient (v2) is performed at forward rapidity (2.5&lt;y&lt;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&lt;pT&lt;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.}},
  author       = {{Acharya, S and Adolfsson, Jonatan and Christiansen, Peter and Matonoha, Oliver and Nassirpour, Adrian and Oskarsson, Anders and Richert, Tuva and Vazquez Rueda, Omar and Silvermyr, David and Stenlund, Evert and Zurlo, N}},
  issn         = {{1079-7114}},
  keywords     = {{Atomic physics; Physics; Experimental evidence; Forward rapidity; Pb-Pb collisions; Positive value; Scalar product; Standard deviation; Transport models; Transverse momenta; Binary alloys}},
  language     = {{eng}},
  number       = {{19}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Letters}},
  title        = {{Measurement of Υ(1S) Elliptic Flow at Forward Rapidity in Pb-Pb Collisions at √sNN=5.02  TeV}},
  url          = {{http://dx.doi.org/10.1103/PhysRevLett.123.192301}},
  doi          = {{10.1103/PhysRevLett.123.192301}},
  volume       = {{123}},
  year         = {{2019}},
}