We present evidence for the b→d penguin-dominated decays B+→K̅ 0K+ and B0→K0K̅ 0 in 227×10^6 Υ(4S)→BB̅ decays collected with the BABAR detector. We measure the branching fractions B(B+→K̅ 0K+)=(1.5±0.5±0.1)×10-6(<2.4×10-6) and B(B0→K0K̅ 0)=(1.19-0.35+0.40±0.13)×10-6, where the uncertainties are statistical and systematic, respectively. We also present improved measurements of the charge-averaged branching fraction B(B+→K0π+)=(26.0±1.3±1.0)×10-6 and CP-violating charge asymmetry ACP(K0π+)=-0.09±0.05±0.01, where the uncertainties are statistical and systematic, respectively.
Evidence for B+→K̅ 0K+ and B0→K0K̅ 0, and Measurement of the Branching Fraction and Search for Direct CP Violation in B+→K0π+
SIMI, GABRIELE;MARGONI, MARTINO;SIMONETTO, FRANCO;STROILI, ROBERTO;VOCI, CESARE;
2005
Abstract
We present evidence for the b→d penguin-dominated decays B+→K̅ 0K+ and B0→K0K̅ 0 in 227×10^6 Υ(4S)→BB̅ decays collected with the BABAR detector. We measure the branching fractions B(B+→K̅ 0K+)=(1.5±0.5±0.1)×10-6(<2.4×10-6) and B(B0→K0K̅ 0)=(1.19-0.35+0.40±0.13)×10-6, where the uncertainties are statistical and systematic, respectively. We also present improved measurements of the charge-averaged branching fraction B(B+→K0π+)=(26.0±1.3±1.0)×10-6 and CP-violating charge asymmetry ACP(K0π+)=-0.09±0.05±0.01, where the uncertainties are statistical and systematic, respectively.
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