NRQCD MATRIX-ELEMENTS IN POLARIZATION OF J PSI PRODUCED FROM B-DECAY/

We present the nonrelativistic QCD (NRQCD) prediction for the polariza tion of the J/psi promptly produced In b-->J/psi+X, as well as the hel icity-summed production rate. We propose that these observables can be of avail in measuring the three most important color-octet NRQCD matr ix elements involved in J/psi production. Anticipating: the measuremen t of the polarization parameter alpha, we determine its expected range given current experimental bounds on the color-octet matrix elements. We find that the leading-order NRQCD prediction for the polarization parameter alpha is expected to lie in the range -0.33 to 0.05 whereas the color-singlet model prediction is -0.40 +/- 0.04.