Search for lepton-number violatingB+→X−ℓ+ℓ′+decays

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Abstract

We report on a search for eleven lepton-number violating processes ${B}^{+}\ensuremath{\rightarrow}{X}^{\ensuremath{-}}{\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{'}+}$ with ${X}^{\ensuremath{-}}={K}^{\ensuremath{-}}$, ${\ensuremath{\pi}}^{\ensuremath{-}}$, ${\ensuremath{\rho}}^{\ensuremath{-}}$, ${K}^{*\ensuremath{-}}$, or ${D}^{\ensuremath{-}}$ and ${\ensuremath{\ell}}^{+}/{\ensuremath{\ell}}^{\ensuremath{'}+}={e}^{+}$ or ${\ensuremath{\mu}}^{+}$, using a sample of $471\ifmmode\pm\else\textpm\fi{}3$ million $B\overline{B}$ events collected with the BABAR detector at the PEP-II ${e}^{+}{e}^{\ensuremath{-}}$ collider at the SLAC National Accelerator Laboratory. We find no evidence for any of these modes and place 90% confidence level upper limits on their branching fractions in the range $(1.5--26)\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}7}$.

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