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Measurement of the inclusive branching fractions for Bs0B_s^0 decays into DD mesons via hadronic tagging

Collaborations
Nov 21, 2024
23 pages
e-Print:
Report number:
  • Belle II Preprint 2024-030,
  • KEK Preprint 2024-32
Experiments:
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Abstract: (arXiv)
We report measurements of the absolute branching fractions B(Bs0→Ds±X)\mathcal{B}(B_s^0 \to D_s^{\pm} X), B(Bs0→D0/Dˉ0X)\mathcal{B}(B_s^0 \to D^0/\bar{D}^0 X), and B(Bs0→D±X)\mathcal{B}(B_s^0 \to D^{\pm} X), where the latter is measured for the first time. The results are based on a 121.4 fb−1^{-1} data sample collected at the Υ(10860)\Upsilon(10860) resonance by the Belle detector at the KEKB asymmetric-energy e+e−e^+ e^- collider. We reconstruct one Bs0B_s^0 meson in e+e−→Υ(10860)→Bs∗Bˉs∗e^+e^- \to \Upsilon(10860) \to B_s^{*} \bar{B}_s^{*} events and measure yields of Ds+D_s^+, D0D^0, and D+D^+ mesons in the rest of the event. We obtain B(Bs0→Ds±X)=(68.6±7.2±4.0)%\mathcal{B}(B_s^0 \to D_s^{\pm} X) = (68.6 \pm 7.2 \pm 4.0)\%, B(Bs0→D0/Dˉ0X)=(21.5±6.1±1.8)%\mathcal{B}(B_s^0 \to D^0/\bar{D}^0 X) = (21.5 \pm 6.1 \pm 1.8)\%, and B(Bs0→D±X)=(12.6±4.6±1.3)%\mathcal{B}(B_s^0 \to D^{\pm} X) = (12.6 \pm 4.6 \pm 1.3)\%, where the first uncertainty is statistical and the second is systematic. Averaging with previous Belle measurements gives B(Bs0→Ds±X)=(63.4±4.5±2.2)%\mathcal{B}(B_s^0 \to D_s^{\pm} X) = (63.4 \pm 4.5 \pm 2.2)\% and B(Bs0→D0/Dˉ0X)=(23.9±4.1±1.8)%\mathcal{B}(B_s^0 \to D^0/\bar{D}^0 X) = (23.9 \pm 4.1 \pm 1.8)\%. For the Bs0B_s^0 production fraction at the Υ(10860)\Upsilon(10860), we find fs=(21.4−1.7+1.5)%f_s = (21.4^{+1.5}_{-1.7})\%.
Note:
  • 23 pages, 9 figures, submitted to JHEP