Search for rare decays B⁺ → D_s^(∗)+η, D_s^(∗)+K⁰, D⁺η, and D⁺K⁰

2022/08/30 by Belle Collaboration, Kumar, M., Bhardwaj, V. +196
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2208.14218

Abstract

We present a study of rare decay modes B⁺ → D_s⁺h⁰, B⁺ → D_s^∗+h⁰, and B⁺ → D⁺h⁰, where h⁰ denotes the neutral mesons η or K⁰, using a data sample of (772 ± 10 ) × 10⁶ BB events produced at the Υ(4S) resonance. The data were collected by the Belle detector operating at the asymmetric-energy KEKB collider. We observe no evidence for these decays, so we provide upper limits at the 90% confidence level on the branching fractions of B⁺ → D_s⁺h⁰, D_s^∗+h⁰, and D⁺h⁰ decay modes. Along with rare decay modes, we report improved measurements of the color-suppressed decay branching fractions B(B⁰ → D⁰η) = (26.6 ± 1.2 ± 2.1) × 10^-5 and B(B⁰ → D⁰K⁰) = (5.6 ± 0.5 ± 0.2) × 10^-5. The first and second uncertainties are statistical and systematic, respectively.

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