Measurements ofB→D¯Ds0*+(2317)decay rates and a search for isospin partners of theDs0*+(2317)

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Abstract

We report improved measurements of the product branching fractions $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{\overline{D}}^{0}{D}_{s0}^{*+}(2317))\ifmmode\times\else\texttimes\fi{}\mathcal{B}({D}_{s0}^{*+}(2317)\ensuremath{\rightarrow}{D}_{s}^{+}{\ensuremath{\pi}}^{0})=(8.{0}_{\ensuremath{-}1.2}^{+1.3}\ifmmode\pm\else\textpm\fi{}1.1\ifmmode\pm\else\textpm\fi{}0.4)\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}4}$ and $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{\ensuremath{-}}{D}_{s0}^{*+}(2317))\ifmmode\times\else\texttimes\fi{}\mathcal{B}({D}_{s0}^{*+}(2317)\ensuremath{\rightarrow}\phantom{\rule{0ex}{0ex}}{D}_{s}^{+}{\ensuremath{\pi}}^{0})=(10.{2}_{\ensuremath{-}1.2}^{+1.3}\ifmmode\pm\else\textpm\fi{}1.0\ifmmode\pm\else\textpm\fi{}0.4)\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}4}$, where the first errors are statistical, the second are systematic and the third are from $D$ and ${D}_{s}^{+}$ branching fractions. In addition, we report negative results from a search for hypothesized neutral (${\mathbf{z}}^{0}$) and doubly charged (${\mathbf{z}}^{++}$) isospin partners of the ${D}_{s0}^{*+}(2317)$ and provide upper limits on the product branching fractions $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{0}{\mathbf{z}}^{0})\ifmmode\times\else\texttimes\fi{}\mathcal{B}({\mathbf{z}}^{0}\ensuremath{\rightarrow}{D}_{s}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})$ and $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{D}^{\ensuremath{-}}{\mathbf{z}}^{++})\ifmmode\times\else\texttimes\fi{}\mathcal{B}({\mathbf{z}}^{++}\ensuremath{\rightarrow}{D}_{s}^{+}{\ensuremath{\pi}}^{+})$ that are more than an order of magnitude smaller than theoretical expectations for the hypotheses that the ${D}_{s0}^{*+}(2317)$ is a member of an isospin triplet. The analysis uses a $711\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample containing 772 million $B\overline{B}$-meson pairs collected at the $\mathrm{\ensuremath{\Upsilon}}(4S)$ resonance in the Belle detector at the KEKB collider.

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