Improved Measurements of B⁰ → D⁰ K⁰ and B⁰ → D⁰ K^*0 Branching Fractions

2004/08/23 by Abe, K.
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.hep-ex/0408108

Abstract

We report on an improved study of B⁰ → D^(*)0 K^(*)0 decays, based on 274 × 10⁶ B B events collected with the Belle detector at KEKB. The following branching fractions have been measured: \cal B(B⁰ → D⁰ K⁰) = (3.72 ± 0.65 ± 0.37) × 10^-5 and \cal B(B⁰ → D⁰ K^*0) = (3.08 ± 0.56 ± 0.31) × 10^-5. We also obtain evidence with 3.2σ significance for B⁰ → D^*0 K⁰ with \cal B(B⁰ → D^*0 K⁰) = (3.2^+1.2_-1.1 ± 0.4) × 10^-5. No significant signal has been found for the B⁰ → D^*0 K^*0 and B⁰ → D^(*)0 K^*0 decay modes, and upper limits at 90% CL are presented.

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