Measurement of the inclusive J/ψ polarization at forward rapidity in pp collisions at s√=8 TeV

S Acharya, F. T. Acosta, D. Adamova, Jonatan Adolfsson, M. M. Aggarwal, Z. Ahammed, S. U. Ahn, Peter Christiansen, Martin Ljunggren, Adrian Nassirpour, Anders Oskarsson, Tuva Richert, David Silvermyr, Evert Stenlund, Vytautas Vislavicius, S. Zou, ALICE Collaboration

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We report on the measurement of the inclusive J/ψ polarization parameters in pp collisions at a center of mass energy s√=8 TeV with the ALICE detector at the LHC. The analysis is based on a data sample corresponding to an integrated luminosity of 1.23 pb−1. J/ψ resonances are reconstructed in their di-muon decay channel in the rapidity interval 2.5<y<4.0 and over the transverse-momentum interval 2<pT<15 GeV/c. The three polarization parameters (λθ, λφ, λθφ) are measured as a function of pT both in the helicity and Collins-Soper reference frames. The measured J/ψ polarization parameters are found to be compatible with zero within uncertainties, contrary to expectations from all available predictions. The results are compared with the measurement in pp collisions at s√=7 TeV.
Original languageEnglish
Article number562
JournalEuropean Physical Journal C
Issue number7
Publication statusPublished - 2018

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Subject classification (UKÄ)

  • Subatomic Physics


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