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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 (10.087±0.044)×109J/ψ 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 ΞΞ0eν¯e. No significant signal is observed and the upper limit on the branching fraction B(ΞΞ0eν¯e) is set to be 2.59×104 at 90% confidence level. This result is one order of magnitude more strict than the previous best limit.