Search for the lepton number violating decay ${\Sigma }^{-}\to p{e}^{-}{e}^{-}$ and the rare inclusive decay ${\Sigma }^{-}\to {\Sigma }^{+}X$

Abstract

Using a data sample of $(1310.6\pm 7.0)\times 10^6$ $J/\psi$ events taken with the BESIII detector at the center-of-mass energy of 3.097 GeV, we search for the first time for the lepton number violating decay ${\Sigma }^{-}\to p{e}^{-}{e}^{-}$ and the rare inclusive decay ${\Sigma }^{-}\to {\Sigma }^{+}X$, where $X$ denotes any possible particle combination. The ${\Sigma }^{-}$ candidates are tagged in $J/\psi \to \bar{\Sigma }(1385{)}^{+}{\Sigma }^{-}$ decays. No signal candidates are found, and the upper limits on the branching fractions at the 90\% confidence level are determined to be $\mathcal{B}({\Sigma }^{-}\to p{e}^{-}{e}^{-})<6.7\times 10^{-5}$ and $\mathcal{B}({\Sigma }^{-}\to {\Sigma }^{+}X)<1.2\times 10^{-4}$.

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• $\Delta$L=2 hyperon decays induced by Majorana neutrinos and doubly-charged scalars
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• Sterile neutrinos in ${\Lambda }_b^0\to ({\Lambda }_c^{+},p^{+}){\ell }_1^{-}{\ell }_2^{-}{\ell }_3^{+}\nu$ decays
• New Physics Searches at Kaon and Hyperon Factories