Measurement of the branching fractions of $\bar{B} \to D^{(*)} K^{\mathstrut -} K_{(S)}^{(*)0}$ and $\bar{B} \to D^{(*)} D_s^{\mathstrut -}$ decays at Belle II

Sumitted to PubDB: 2024-02-21

Category: Physics / performance paper

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Principal Authors Valerio Bertacchi, Karim Trabelsi
Date 2024-08-26
Working group B Hadronic
Belle II Number BELLE2-PUB-PH-2024-054
Abstract We present measurements of the branching fractions of eight $\overline B{}^0\to D^{(*)+} K^- K^{(*)0}_{(S)}$, $B^{-}\to D^{(*)0} K^- K^{(*)0}_{(S)}$ decay channels. The results are based on data from SuperKEKB electron-positron collisions at the $\Upsilon(4S)$ resonance collected with the Belle II detector, corresponding to an integrated luminosity of $362~\text{fb}^{-1}$. The event yields are extracted from fits to the distributions of the difference between expected and observed $B$ meson energy, and are efficiency-corrected as a function of $m(K^-K^{(*)0}_{(S)})$ and $m(D^{(*)}K^{(*)0}_{(S)})$ in order to avoid dependence on the decay model. These results include the first observation of $\overline B{}^0\to D^+K^-K_S^0$, $B^-\to D^{*0}K^-K_S^0$, and $\overline B{}^0\to D^{*+}K^-K_S^0$ decays and a significant improvement in the precision of the other channels compared to previous measurements. The helicity-angle distributions and the invariant mass distributions of the $K^- K^{(*)0}_{(S)}$ systems are compatible with quasi-two-body decays via a resonant transition with spin-parity $J^P=1^-$ for the $K^-K_S^0$ systems and $J^P= 1^+$ for the $K^-K^{*0}$ systems. We also present measurements of the branching fractions of four $\overline B{}^0\to D^{(*)+} D_s^-$, $B^{-}\to D^{(*)0} D_s^- $ decay channels with a precision compatible to the current world averages.
ArXiv https://arxiv.org/abs/2406.06277
Inspire https://inspirehep.net/literature/2796563
DOI 10.1007/JHEP08(2024)206
Reference JHEP 08, 206 (2024)
Bibtex 
@article{Belle-II:2024xtf,
    author = "Adachi, Ichiro and others",
    collaboration = "Belle-II",
    title = "{Measurement of the branching fractions of $ \overline{B} $ {\textrightarrow} D$^{(*)}$K$^{−} {K}_{(S)}^{\left(\ast \right)0} $ and $ \overline{B} $ {\textrightarrow} D$^{(*)} {D}_s^{-} $ decays at Belle II}",
    eprint = "2406.06277",
    archivePrefix = "arXiv",
    primaryClass = "hep-ex",
    reportNumber = "Belle II Preprint: 2024-014, KEK Preprint: 2024-8",
    doi = "10.1007/JHEP08(2024)206",
    journal = "JHEP",
    volume = "08",
    pages = "206",
    year = "2024"
}
Journal JHEP

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