Search for new physics with baryons at BESIII

Abstract

The BESIII experiment at BEPCII provides a clean environment to test baryon-dark sector connections and baryon-number violation. Using $10^{10}$ $J/\psi$ events, searches were performed for ${\Sigma }^{+}\to p+\text{inv}$, ${\Xi }^{-}\to {\pi }^{-}+\text{inv}$, and $\bar{\Lambda }-\Lambda$ oscillations. No excess was observed, yielding $\mathcal{B}({\Sigma }^{+}\to p+\text{inv})<3.2\times 10^{-5}$, $\mathcal{B}({\Xi }^{-}\to {\pi }^{-}+\text{inv})<(4-7)\times 10^{-5}$, and $P(\Lambda )<4.4\times 10^{-6}$ (90\% C.L.). These are the most stringent limits on invisible baryon decays and $\Delta B=2$ transitions in strange baryons, probing new physics beyond the Standard Model.

4 pages

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