Study of exclusive B decays to charmed baryons

Le résumé fourni par la source

Using $29.1{\mathrm{fb}}^{\ensuremath{-}1}$ of data accumulated at the $\ensuremath{\Upsilon}(4S)$ with the Belle detector at KEKB, we have studied the decay modes ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\Lambda}}_{c}^{+}\overline{p}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}},$ ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\Lambda}}_{c}^{+}\overline{p}{\ensuremath{\pi}}^{\ensuremath{-}},$ and ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\Lambda}}_{c}^{+}\overline{p}.$ We report branching fractions of exclusive B decays to charmed baryons with four-, three- and two-body final states, including intermediate ${\ensuremath{\Sigma}}_{c}^{++}$ and ${\ensuremath{\Sigma}}_{c}^{0}$ states. We observed ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\Sigma}}_{c}{(2455)}^{++}\overline{p}{\ensuremath{\pi}}^{\ensuremath{-}}$ for the first time with a branching fraction of ${(2.38}_{\ensuremath{-}0.55}^{+0.63}\ifmmode\pm\else\textpm\fi{}0.41\ifmmode\pm\else\textpm\fi{}0.62)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ and observed evidence for the two-body decay ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\Sigma}}_{c}{(2455)}^{0}\overline{p}$ with a branching fraction of ${(0.45}_{\ensuremath{-}0.19}^{+0.26}\ifmmode\pm\else\textpm\fi{}0.07\ifmmode\pm\else\textpm\fi{}0.12)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}.$ We also set improved upper limits for the two-body decays ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\Lambda}}_{c}^{+}\overline{p}$ and ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\Sigma}}_{c}{(2520)}^{0}\overline{p}.$

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