Abstract
We compute the J/ψ polarization observables λθ, λϕ, λθϕ in a Color Glass Condensate (CGC) + nonrelativistic QCQ (NRQCD) formalism that includes contributions from both color singlet and color octet intermediate states. Our results are compared to low pT data on J/ψ polarization from the LHCb and ALICE experiments on proton-proton collisions at center-of-mass energies of \( \sqrt{s}=7 \) TeV and 8 TeV. Our CGC+NRQCD computation provides a better description of data for pT ≤ 15 GeV relative to extant next-to-leading (NLO) calculations within the collinear factorization framework. These results suggest that higher order computations in the CGC+NRQCD framework have the potential to greatly improve the accuracy of extracted values of the NRQCD universal long distance matrix elements.
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Ma, YQ., Stebel, T. & Venugopalan, R. J/ψ polarization in the CGC+NRQCD approach. J. High Energ. Phys. 2018, 57 (2018). https://doi.org/10.1007/JHEP12(2018)057
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DOI: https://doi.org/10.1007/JHEP12(2018)057