| Abstract |
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We report searches for B-meson decays to the charmless final states
rho K* and f0(980) K* with a sample of 232 million BBbar pairs
collected with the BABAR detector at the PEP-II asymmetric-energy e+e-
collider at SLAC.
We measure the following branching fractions in units of 10^{-6}:
B (B+ --> rho0 K*+) = 3.6 +/- 1.7 +/- 0.8 (< 6.1),
B (B+ --> rho+ K*0) = 9.6 +/- 1.7 +/- 1.5,
B (B0 --> rho- K*+) = 5.4 +/- 3.6 +/- 1.6 (< 12.0),
B (B0 --> rho0 K*0) = 5.6 +/- 0.9 +/- 1.3,
B (B+ --> f0(980) K*+) = 5.2 +/- 1.2 +/- 0.5, and
B (B0 --> f0(980) K*0) = 2.6 +/- 0.6 +/- 0.9 (< 4.3).
The first error quoted is statistical, the second systematic, and the upper
limits, in parentheses, are given at the 90% confidence level.
For the statistically significant modes we also measure the fraction of
longitudinal polarization and the charge asymmetry:
f_L (B+ --> rho+ K*0) = 0.52 +/- 0.10 +/- 0.04,
f_L (B0 --> rho0 K*0) = 0.57 +/- 0.09 +/- 0.08,
A_CP (B+ --> rho+ K*0) = -0.01 +/- 0.16 +/- 0.02,
A_CP (B0 --> rho0 K*0) = 0.09 +/- 0.19 +/- 0.02,
A_CP (B+ --> f0(980) K*+) = -0.34 +/- 0.21 +/- 0.03, and
A_CP (B0 --> f0(980) K*0) = -0.17 +/- 0.28 +/- 0.02.
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