Measurement of Upsilon(1S) Elliptic Flow at Forward Rapidity in Pb-Pb Collisions at root s(NN)=5.02 TeV
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and Zinovjev, G. and Zurlo, N. and A Large Ion Collider Expt Collabor... Show more Show less
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Abstract
The first measurement of the Upsilon(1S) elliptic flow coefficient
(v(2)) is performed at forward rapidity (2.5 < y < 4) in Pb-Pb
collisions at root s(NN) = 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 Upsilon(1S)v(2) is consistent with 0
and with the small positive values predicted by transport models within
uncertainnties. The v(2) coefficient in 2 < p(T) < 15 GeV=c is lower than
that of inclusive J/psi mesons in the same p(T) interval by 2.6 standard
deviations. These results, combined with earlier suppression
measurements, are in agreement with a scenario in which the Upsilon(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/psi case there is substantial experimental evidence of an additional
regeneration component.... Show more Show less