Prompt J/psi Polarization at the Tevatron

Abstract

The polarization of prompt J/psi at the Tevatron is calculated within the nonrelativistic QCD (NRQCD) 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 prediction agrees with measurements from the CDF collaboration at intermediate values of p_T, but disagrees at the large values of p_T measured.

Comments: 5 pages, 2 figures, Talk given at 5th Workshop on QCD, 3-7 January 2000, Villefranche-sur-Mer, France