Search for collectivity with azimuthal J/ψ -hadron correlations in high multiplicity p–Pb collisions at View the MathML source and 8.16 TeV.
|Authors||ALICE Collaboration and Barnby, Lee|
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
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 View the MathML source TeV, suggesting a common mechanism at the origin of the J/ψ v2.
|Keywords||Particle physics; Relativistic heavy ion collisions|
|Journal||Physical Letters B|
|Digital Object Identifier (DOI)||https://doi.org/10.1016/j.physletb.2018.02.039|
|Web address (URL)||http://hdl.handle.net/10545/622345|
|Publication dates||10 May 2018|
|Publication process dates|
|Deposited||16 Mar 2018, 09:26|
|Contributors||STFC Daresbury Laboratory|
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