Polarization of Prompt J/psi at the Tevatron
High Energy Physics - Phenomenology
2011-03-23 v3
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/\psi is predicted to increase from near 0 at p_T = 5 GeV to about 0.5 at p_T = 20 GeV. The prediction is consistent with measurements by the CDF Collaboration at intermediate values of p_T, but disagrees by about 3 standard deviations at the largest values of p_T measured.
Cite
@article{arxiv.hep-ph/9911436,
title = {Polarization of Prompt J/psi at the Tevatron},
author = {Eric Braaten and Bernd A. Kniehl and Jungil Lee},
journal= {arXiv preprint arXiv:hep-ph/9911436},
year = {2011}
}
Comments
4 pages, 2 figures, one reference added, accepted for publication in Phys. Rev. D