| Abstract |
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We describe searches for B meson decays to the charmless
vector-vector final states omega K*, omega rho, omega omega, and
omega phi with 233 times 10^{6} BB pairs produced in e+e-
annihilation at sqrt{s}=10.58 GeV. We also search for the
vector-scalar B decay to omega f_0. We measure the following
branching fractions in units of 10^{-6}: BR(B0 --> omega K*0) = 2.4
+/- 1.1 +/- 0.7 (<4.2), BR(B+ --> omega K*+) = 0.6 {+1.4}_{-1.2}
{+1.1}_{-0.9} (<3.4), BR(B0 --> omega rho0) = -0.6 +/- 0.7
{+0.8}_{-0.3} (<1.5), BR(B+ --> omega rho+) = 10.6 +/- 2.1
{+1.6}_{-1.0}, BR(B0 --> omega omega) = 1.8 {+1.3}_{-0.9} +/- 0.4
(<4.0), BR(B0 --> omega phi) = 0.1 +/- 0.5 +/- 0.1 (<1.2), and BR(B0
--> omega f_0) = 0.9 +/- 0.4 {+0.2}_{-0.1} (<1.5). In each case the
first error quoted is statistical, the second systematic, and the
upper limits are defined at the 90% confidence level. For B+ -->
omega rho+ decays we also measure the longitudinal spin component
f_L=0.82 +/- 0.11 +/- 0.02 and the charge asymmetry A_CP=0.04 +/-
0.18 +/- 0.02.
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