A full angular analysis has been performed for the pseudo-scalar
to vector-vector decays B0 --> J/psi K*0 and B0(s) --> J/psi phi to
determine the amplitudes for decays with parity-even longitudinal (A_0) and
transverse (A_||) polarization and parity-odd transverse (A_\perp)
polarization. The measurements are based on 190 B0 candidates and 40 B0(s)
candidates collected from a data set corresponding to 89 pb-1 of p anti-p
collisions at s**(1/2) = 1.8 TeV at the Fermilab Tevatron. In both decays the
decay amplitude for longitudinal polarization dominates : |A_0|2 = 0.59 +/-
0.06 +/- 0.01 for the B0 decay and |A_0|2 = 0.61 +/- 0.14 +/- 0.02 for the
B0(s) decay. The parity-odd amplitude is found to be small: |A_\perp|2 =
0.13+0.12_ -0.09 +/- 0.06 for B0 and |A_\perp|2 = 0.23 +/- 0.19 +/- 0.04
for B0(s).
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Updated: Wednesday, 2000 November 29 15:34:12 CST automatically from input from Carol Picciolo