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Search for baryon and lepton number violating decays <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>D</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mo stretchy="false">→</mml:mo><mml:mover accent="true"><mml:mi mathvariant="normal">Λ</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover><mml:mo stretchy="false">(</mml:mo><mml:msup><mml:mover accent="true"><mml:mi mathvariant="normal">Σ</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover><mml:mn>0</…
Using a $2.93\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample of electron-positron collisions taken with the BESIII detector at a center-of-mass energy of 3.773 GeV, which corresponds to $(8296\ifmmode\pm\else\textpm\fi{}31\ifmmode\pm\else\textpm\fi{}64)\ifmmode\times\else\texttimes\fi{}{10}^{3}{D}^{+}{D}^{\ensuremath{-}}$ pairs, we search for the baryon and lepton number violating decays ${D}^{+}\ensuremath{\rightarrow}\overline{\mathrm{\ensuremath{\Lambda}}}({\overline{\mathrm{\ensuremath{\Sigma}}}}^{0}){e}^{+}$ and ${D}^{+}\ensuremath{\rightarrow}\mathrm{\ensuremath{\Lambda}}({\mathrm{\ensuremath{\Sigma}}}^{0}){e}^{+}$. No obvious signals are found with the current statistics and …