Search for collectivity with azimuthal J/ψ-hadron correlations in high multiplicity p-Pb collisions at ,√<i>s</i><sub>NN</sub>=5.02 and 8.16 TeV



Acharya, S, Adamova, D, Adolfsson, J, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aiola, S
et al (show 1003 more authors) (2018) Search for collectivity with azimuthal J/ψ-hadron correlations in high multiplicity p-Pb collisions at ,√<i>s</i><sub>NN</sub>=5.02 and 8.16 TeV. PHYSICS LETTERS B, 780. pp. 7-20.

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Abstract

We present a measurement of azimuthal correlations between inclusive J/ψ and charged hadrons in p–Pb collisions recorded with the ALICE detector at the CERN LHC. The J/ψ are reconstructed at forward (p-going, 2.03<y<3.53) and backward (Pb-going, −4.46<y<−2.96) rapidity via their μ+μ− decay channel, while the charged hadrons are reconstructed at mid-rapidity (|η|<1.8). The correlations are expressed in terms of associated charged-hadron yields per J/ψ trigger. A rapidity gap of at least 1.5 units is required between the trigger J/ψ 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 Δφ≈0 and Δφ≈π similar to those previously found in two-particle correlations at middle and forward rapidity. The corresponding second-order Fourier coefficient (v2) in the transverse momentum interval between 3 and 6 GeV/c is found to be positive with a significance of about 5σ. The obtained results are similar to the J/ψ v2 coefficients measured in Pb–Pb collisions at sNN=5.02 TeV, suggesting a common mechanism at the origin of the J/ψ v2.

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 13 Mar 2018 15:19
Last Modified: 11 Oct 2023 05:28
DOI: 10.1016/j.physletb.2018.02.039
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3018968