| Abstract |
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We present preliminary measurements of branching fractions and CP-violating
asymmetries in decays of B mesons to two-body final states containing a K0.
The results are based on a data sample of approximately 227 million
Upsilon(4S) decays collected with the BABAR detector
at the PEP-II asymmetric-energy B Factory at SLAC. We measure
BF(B+ --> K0pi+) = (26.0 +/- 1.3 +/- 1.0) x 10-6,
BF(B+ --> K0barK+) = (1.45 +0.53 -0.46 +/- 0.11) x 10-6 (< 2.35 x 10-6), and
BF(B0 --> K0K0bar) = (1.19 +0.40 -0.35 +/- 0.13) x 10^-6, where the
first uncertainty is statistical and the second is systematic, and the upper
limit is at a 90% confidence level.
The significance of the BF(B+ --> K0barK+) and BF(B0 --> K0K0bar) results are
3.5 sigma and 4.5 sigma, respectively, including systematic uncertainties.
In addition, we obtain a measurement
of the CP-violating asymmetry for the BF(B+ --> K0pi+) mode and we
determine a 90% confidence-level interval for the asymmetry in the BF(B+ --> K0barK+) mode:
ACP(B+ --> K0pi+) = -0.087 +/- 0.046 +/- 0.010 and
ACP(B+ --> K0barK+) is in [-0.43, 0.68].
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