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Search for a massless particle beyond the Standard Model in the \(Σ^+\rightarrow p+{\rm invisible}\) decay

By Besiii Collaboration and others
A massless particle beyond the Standard Model is searched for in the two-body decay \(\Sigma^+\rightarrow p+{\rm invisible}\) using \((1.0087\pm0.0044)\times10^{10}\) \(J/\psi\) events collected at a center-of-mass energy of \(\sqrt{s}=3.097\) GeV with the BESIII detector at the BEPCII collider. No significant signal is observed, and the upper limit on the branching fraction... Show more
April 6, 2024
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