| Abstract |
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Observation of B->etarho+ and search for B0 Decays
to eta'eta, etapi0, eta'pi0, and omegapi0
We present measurements of branching fractions for five B-meson decays to
two-body charmless final states. The data, collected with the BABAR detector
at the Stanford Linear Accelerator Center, represent 459 million BBbar pairs.
The results for branching fractions are, in units of 10^{-6} (upper limits
at 90% C.L.):
BR(B+ -> etarho+) = 9.9 +/- 1.2 +/- 0.8,
BR(B0 -> eta'eta) = 0.5 +/- 0.4 +/- 0.1\ (<1.2),
BR(B0 -> etapi0) = 0.9 +/- 0.4 +/- 0.1\ (<1.5),
BR(B0 -> eta'pi0) = 0.9 +/- 0.4 +/- 0.1\ (<1.5), and
BR(B0 -> omegapi0) = 0.07 +/- 0.26 +/- 0.02\ (<0.5).
The first error quoted is statistical and the second systematic. For the
etarho+ mode, we measure the charge asymmetry
Ach(B+ -> etarho+) = 0.13 +/- 0.11 +/- 0.02.
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