6533b7ddfe1ef96bd1275202

RESEARCH PRODUCT

Evidence forB+→J/ψpΛ¯and Search forB0→J/ψpp¯

subject

description

We have performed a search for the decays ${B}^{+}\ensuremath{\rightarrow}J/\ensuremath{\psi}p\overline{\ensuremath{\Lambda}}$ and ${B}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}p\overline{p}$ in a data set of $(88.9\ifmmode\pm\else\textpm\fi{}1.0)\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\Upsilon}(4S)$ decays collected by the BABAR experiment at the PEP-II ${e}^{+}{e}^{\ensuremath{-}}$ storage ring at the Stanford Linear Accelerator Center. Four charged $B$ candidates have been observed with an expected background of $0.21\ifmmode\pm\else\textpm\fi{}0.14$ events. The corresponding branching fraction is $({12}_{\ensuremath{-}6}^{+9})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, where statistical and systematic uncertainties have been combined. The result can be interpreted as a 90% confidence level (C.L.) upper limit of $26\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$. We also find one ${B}^{0}$ candidate, with an expected background of $0.64\ifmmode\pm\else\textpm\fi{}0.17$ events, implying a 90% C.L. upper limit of $1.9\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$.