Measurement of the inclusive branching fractions for B_s⁰ decays into D mesons via hadronic tagging

2024/11/21 by Belle, Collaborations, Belle II, : +452
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2411.14032

Abstract

We report measurements of the absolute branching fractions B(B_s⁰ → D_s^± X), B(B_s⁰ → D⁰/D⁰ X), and B(B_s⁰ → D^± X), where the latter is measured for the first time. The results are based on a 121.4 fb^-1 data sample collected at the Υ(10860) resonance by the Belle detector at the KEKB asymmetric-energy e⁺ e^- collider. We reconstruct one B_s⁰ meson in e⁺e^- → Υ(10860) → B_s^* B_s^* events and measure yields of D_s⁺, D⁰, and D⁺ mesons in the rest of the event. We obtain B(B_s⁰ → D_s^± X) = (68.6 ± 7.2 ± 4.0)%, B(B_s⁰ → D⁰/D⁰ X) = (21.5 ± 6.1 ± 1.8)%, and B(B_s⁰ → D^± X) = (12.6 ± 4.6 ± 1.3)%, where the first uncertainty is statistical and the second is systematic. Averaging with previous Belle measurements gives B(B_s⁰ → D_s^± X) = (63.4 ± 4.5 ± 2.2)% and B(B_s⁰ → D⁰/D⁰ X) = (23.9 ± 4.1 ± 1.8)%. For the B_s⁰ production fraction at the Υ(10860), we find f_s = (21.4^+1.5_-1.7)%.

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