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Study of J/ψ azimuthal anisotropy at forward rapidity in Pb-Pb collisions at √sNN=5.02 TeV

Acharya, S ; Adolfsson, Jonatan LU ; Christiansen, Peter LU ; Ljunggren, Martin LU ; Nassirpour, Adrian LU orcid ; Oskarsson, Anders LU ; Richert, Tuva LU ; Silvermyr, David LU orcid ; Stenlund, Evert LU and Vislavicius, Vytautas LU , et al. (2019) In Journal of High Energy Physics 2019(2).
Abstract
The second (v 2 ) and third (v 3 ) flow harmonic coefficients of J/ψ mesons are measured at forward rapidity (2.5 < y < 4.0) in Pb-Pb collisions at sNN=5.02 TeV with the ALICE detector at the LHC. Results are obtained with the scalar product method and reported as a function of transverse momentum, p T , for various collision centralities. A positive value of J/ψ v 3 is observed with 3.7σ significance. The measurements, compared to those of prompt D 0 mesons and charged particles at mid-rapidity, indicate an ordering with v n (J/ψ) < v n (D 0 ) < v n (h ± ) (n = 2, 3) at low and intermediate p T up to 6 GeV/c and a convergence with v 2 (J/ψ) ≈ v 2 (D 0 ) ≈ v 2 (h ± ) at high p T above 6–8 GeV/c. In semi-central collisions... (More)
The second (v 2 ) and third (v 3 ) flow harmonic coefficients of J/ψ mesons are measured at forward rapidity (2.5 < y < 4.0) in Pb-Pb collisions at sNN=5.02 TeV with the ALICE detector at the LHC. Results are obtained with the scalar product method and reported as a function of transverse momentum, p T , for various collision centralities. A positive value of J/ψ v 3 is observed with 3.7σ significance. The measurements, compared to those of prompt D 0 mesons and charged particles at mid-rapidity, indicate an ordering with v n (J/ψ) < v n (D 0 ) < v n (h ± ) (n = 2, 3) at low and intermediate p T up to 6 GeV/c and a convergence with v 2 (J/ψ) ≈ v 2 (D 0 ) ≈ v 2 (h ± ) at high p T above 6–8 GeV/c. In semi-central collisions (5–40% and 10–50% centrality intervals) at intermediate p T between 2 and 6 GeV/c, the ratio v 3 /v 2 of J/ψ mesons is found to be significantly lower (4.6σ) with respect to that of charged particles. In addition, the comparison to the prompt D 0 -meson ratio in the same p T interval suggests an ordering similar to that of the v 2 and v 3 coefficients. The J/ψ v 2 coefficient is further studied using the Event Shape Engineering technique. The obtained results are found to be compatible with the expected variations of the eccentricity of the initial-state geometry. © 2019, The Author(s). (Less)
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author collaboration
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Hadron-Hadron scattering (experiments)
in
Journal of High Energy Physics
volume
2019
issue
2
article number
12
publisher
Springer
external identifiers
  • scopus:85061202505
ISSN
1029-8479
DOI
10.1007/JHEP02(2019)012
language
English
LU publication?
yes
additional info
Export Date: 19 February 2019
id
6392dc34-af1f-4af0-a540-0478d84e5cd8
date added to LUP
2019-02-19 11:04:01
date last changed
2023-11-18 15:22:25
@article{6392dc34-af1f-4af0-a540-0478d84e5cd8,
  abstract     = {{The second (v 2 ) and third (v 3 ) flow harmonic coefficients of J/ψ mesons are measured at forward rapidity (2.5 &lt; y &lt; 4.0) in Pb-Pb collisions at sNN=5.02 TeV with the ALICE detector at the LHC. Results are obtained with the scalar product method and reported as a function of transverse momentum, p T , for various collision centralities. A positive value of J/ψ v 3 is observed with 3.7σ significance. The measurements, compared to those of prompt D 0 mesons and charged particles at mid-rapidity, indicate an ordering with v n (J/ψ) &lt; v n (D 0 ) &lt; v n (h ± ) (n = 2, 3) at low and intermediate p T up to 6 GeV/c and a convergence with v 2 (J/ψ) ≈ v 2 (D 0 ) ≈ v 2 (h ± ) at high p T above 6–8 GeV/c. In semi-central collisions (5–40% and 10–50% centrality intervals) at intermediate p T between 2 and 6 GeV/c, the ratio v 3 /v 2 of J/ψ mesons is found to be significantly lower (4.6σ) with respect to that of charged particles. In addition, the comparison to the prompt D 0 -meson ratio in the same p T interval suggests an ordering similar to that of the v 2 and v 3 coefficients. The J/ψ v 2 coefficient is further studied using the Event Shape Engineering technique. The obtained results are found to be compatible with the expected variations of the eccentricity of the initial-state geometry. © 2019, The Author(s).}},
  author       = {{Acharya, S and Adolfsson, Jonatan and Christiansen, Peter and Ljunggren, Martin and Nassirpour, Adrian and Oskarsson, Anders and Richert, Tuva and Silvermyr, David and Stenlund, Evert and Vislavicius, Vytautas and Zmeskal, J.}},
  issn         = {{1029-8479}},
  keywords     = {{Hadron-Hadron scattering (experiments)}},
  language     = {{eng}},
  number       = {{2}},
  publisher    = {{Springer}},
  series       = {{Journal of High Energy Physics}},
  title        = {{Study of J/ψ azimuthal anisotropy at forward rapidity in Pb-Pb collisions at √sNN=5.02 TeV}},
  url          = {{http://dx.doi.org/10.1007/JHEP02(2019)012}},
  doi          = {{10.1007/JHEP02(2019)012}},
  volume       = {{2019}},
  year         = {{2019}},
}