Polarization of Prompt J/psi at the Tevatron
Eric Braaten, Bernd A. Kniehl, Jungil Lee
Abstract
The polarization of prompt J/psi at the Fermilab Tevatron is calculated within the nonrelativistic QCD factorization framework. The contribution from radiative decays of P-wave charmonium states decreases, but does not eliminate, the transverse polarization at large transverse momentum. The angular distribution parameter alpha for leptonic decays of the J/ψis predicted to increase from near 0 at pT = 5 GeV to about 0.5 at pT = 20 GeV. The prediction is consistent with measurements by the CDF Collaboration at intermediate values of pT, but disagrees by about 3 standard deviations at the largest values of pT measured.
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