J/ψ Elliptic Flow in Pb-Pb Collisions at √sNN = 5.02 TeV
ALICE Collaboration. (2017). J/ψ Elliptic Flow in Pb-Pb Collisions at √sNN = 5.02 TeV. Physical Review Letters, 119(24), Article 242301. https://doi.org/10.1103/PhysRevLett.119.242301
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Physical Review LettersAuthors
Date
2017Copyright
© 2017 CERN, for the ALICE Collaboration. This is an open access article distributed under the terms of the Creative Commons License.
We report a precise measurement of the
J
/
ψ
elliptic flow in Pb-Pb collisions at
√
s
N
N
=
5.02
TeV
with the ALICE detector at the LHC. The
J
/
ψ
mesons are reconstructed at midrapidity (
|
y
|
<
0.9
) in the dielectron decay channel and at forward rapidity (
2.5
<
y
<
4.0
) in the dimuon channel, both down to zero transverse momentum. At forward rapidity, the elliptic flow
v
2
of the
J
/
ψ
is studied as a function of the transverse momentum and centrality. A positive
v
2
is observed in the transverse momentum range
2
<
p
T
<
8
GeV
/
c
in the three centrality classes studied and confirms with higher statistics our earlier results at
√
s
N
N
=
2.76
TeV
in semicentral collisions. At midrapidity, the
J
/
ψ
v
2
is investigated as a function of the transverse momentum in semicentral collisions and found to be in agreement with the measurements at forward rapidity. These results are compared to transport model calculations. The comparison supports the idea that at low
p
T
the elliptic flow of the
J
/
ψ
originates from the thermalization of charm quarks in the deconfined medium but suggests that additional mechanisms might be missing in the models.
...
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Except where otherwise noted, this item's license is described as © 2017 CERN, for the ALICE Collaboration. This is an open access article distributed under the terms of the Creative Commons License.
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