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Search for the hyperon semileptonic decayΞ−→Ξ0e−νe¯
Physical Review D  (IF5.296),  Pub Date : 2021-10-14, DOI: 10.1103/physrevd.104.072007
M. Ablikimet al.(BESIII Collaboration)

Using $\left(10.087±0.044\right)×{10}^{9}\text{\hspace{0.17em}}\text{\hspace{0.17em}}J/\psi$ events collected by the Beijing Spectrum III (BESIII) detector at the Beijing Electron Positron Collider II (BEPCII) collider, we search for the hyperon semileptonic decay ${\mathrm{\Xi }}^{-}\to {\mathrm{\Xi }}^{0}{e}^{-}{\overline{\nu }}_{e}$. No significant signal is observed and the upper limit on the branching fraction $\mathcal{B}\left({\mathrm{\Xi }}^{-}\to {\mathrm{\Xi }}^{0}{e}^{-}{\overline{\nu }}_{e}\right)$ is set to be $2.59×{10}^{-4}$ at 90% confidence level. This result is one order of magnitude more strict than the previous best limit.