Search for collectivity with azimuthal J/psi-hadron correlations in high multiplicity p-Pb collisions at ,root s(NN)=5.02 and 8.16 TeV
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Abstract
We present a measurement of azimuthal correlations between inclusive
J/psi and charged hadrons in p-Pb collisions recorded with the ALICE
detector at the CERN LHC. The J/psi are reconstructed at forward
(p-going, 2.03 < y < 3.53) and backward (Pb-going, -4.46 < y < -2.96)
rapidity via their mu(+)mu(-) decay channel, while the charged hadrons
are reconstructed at mid-rapidity (vertical bar eta vertical bar < 1.8).
The correlations are expressed in terms of associated charged-hadron
yields per W .. trigger. A rapidity gap of at least 1.5 units is required
between the trigger J/psi and the associated charged hadrons. Possible
correlations due to collective effects are assessed by subtracting the
associated per-trigger yields in the low-multiplicity collisions from
those in the high-multiplicity collisions. After the subtraction, we
observe a strong indication of remaining symmetric structures at Delta
phi approximate to 0 and Delta phi approximate to pi), similar to those
previously found in two-particle correlations at middle and forward
rapidity. The corresponding second-order Fourier coefficient (v(2) ) in
the transverse momentum interval between 3 and 6 GeV/c is found to be
positive with a significance of about 5 sigma. The obtained results are
similar to the J/psi v(2) coefficients measured in Pb-Pb collisions at
root s(NN) = 5.02 TeV, suggesting a common mechanism at the origin of
the J/psi v(2) . (C) 2018 The Author. Published by Elsevier B.V.... Show more Show less