The polarization of prompt J/ψ 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 α for leptonic decays of the J/ψ is 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.
|Number of pages||4|
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|Publication status||Published - 2000 Nov 1|
ASJC Scopus subject areas
- Nuclear and High Energy Physics