We report observations of the b→d penguin-dominated decays B+→K̅ 0K+ and B0→K0K̅ 0 in 316 fb-1 of e+e- collision data collected with the BABAR detector. We measure the branching fractions B(B+→K̅ 0K+)=(1.61±0.44±0.09)×10-6 and B(B0→K0K̅ 0)=(1.08±0.28±0.11)×10-6 and the CP-violating charge asymmetry ACP(K̅ 0K+)=0.10±0.26±0.03. Using a vertexing technique previously employed in several analyses of all-neutral final states containing kaons, we report the first measurement of time-dependent CP-violating asymmetries in B0→KS0KS0, obtaining S=-1.28-0.73-0.16+0.80+0.11 and C=-0.40±0.41±0.06. We also report improved measurements of the branching fraction B(B+→K0π+)=(23.9±1.1±1.0)×10-6 and CP-violating charge asymmetry ACP(K0π+)=-0.029±0.039±0.010.
Observation of B+→K̅ 0K+ and B0→K0K̅ 0
SIMI, GABRIELE;GAZ A;MARGONI, MARTINO;SIMONETTO, FRANCO;STROILI, ROBERTO;VOCI, CESARE;
2006
Abstract
We report observations of the b→d penguin-dominated decays B+→K̅ 0K+ and B0→K0K̅ 0 in 316 fb-1 of e+e- collision data collected with the BABAR detector. We measure the branching fractions B(B+→K̅ 0K+)=(1.61±0.44±0.09)×10-6 and B(B0→K0K̅ 0)=(1.08±0.28±0.11)×10-6 and the CP-violating charge asymmetry ACP(K̅ 0K+)=0.10±0.26±0.03. Using a vertexing technique previously employed in several analyses of all-neutral final states containing kaons, we report the first measurement of time-dependent CP-violating asymmetries in B0→KS0KS0, obtaining S=-1.28-0.73-0.16+0.80+0.11 and C=-0.40±0.41±0.06. We also report improved measurements of the branching fraction B(B+→K0π+)=(23.9±1.1±1.0)×10-6 and CP-violating charge asymmetry ACP(K0π+)=-0.029±0.039±0.010.Pubblicazioni consigliate
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