Polarization of Prompt J/psi at the Tevatron

Details Polarization of Prompt J/psi at the Tevatron Polarization of Prompt J/psi at the Tevatron

1999-11-22

arxiv.org/abs/hep-ph/9911436v3

Phys.Rev.D62:094005,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 figures, one reference added, accepted for publication in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.62.094005

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.

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