Search for collectivity with azimuthal J/ψ-hadron correlations in high multiplicity p–Pb collisions at √sNN = 5.02 and 8.16 TeV

Acharya, S. and Antičić, Tome and Erhardt, Filip and Gotovac, Sven and Jerčić, Marko and Lončar, Petra and Mudnić, Eugen and Planinić, Mirko and Poljak, Nikola and Simatović, Goran and Utrobičić, Antonija and Vicković, Linda and Zou, S. (ALICE Collaboration) (2018) Search for collectivity with azimuthal J/ψ-hadron correlations in high multiplicity p–Pb collisions at √sNN = 5.02 and 8.16 TeV. Physics Letters B, 780. pp. 7-20. ISSN 0370-2693

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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 (pgoing, 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 ϕ ≈ 0 and ϕ ≈ 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
Date: 2018
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2018 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3. Received 27 September 2017. Received in revised form 14 February 2018. Accepted 14 February 2018. Available online 2 March 2018.
Divisions: Faculty of Science > Department of Physics
Publisher: Elsevier
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 03 Apr 2018 11:02
Last Modified: 03 Apr 2018 11:02
URI: http://digre.pmf.unizg.hr/id/eprint/5811

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