Search for a massless particle beyond the Standard Model in the ${\Sigma }^{+}\to p+\mathrm{invisible}$ decay

Abstract

A massless particle beyond the Standard Model is searched for in the two-body decay ${\Sigma }^{+}\to p+\mathrm{invisible}$ using $(1.0087\pm 0.0044)\times 10^{10}$ $J/\psi$ 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 $B({\Sigma }^{+}\to p+\mathrm{invisible})$ is determined to be $3.2\times 10^{-5}$ at the 90% confidence level. This is the first search for a flavor-changing neutral current process with missing energy in hyperon decays which plays an important role in constraining new physics models.

arXiv comment11 pages, 5 figures

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• Weak Decays Beyond Leading Logarithms
• Design and Construction of the BESIII Detector
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• First search for $K^{+}\to {\pi }^{+}\nu \bar{\nu }$ using the decay-in-flight technique
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• Search for the Decay K+ -> pi+ pi0 nu nubar
• Rare hyperon decays with missing energy
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Cited by in corpus (4)

• Flavor phenomenology of light dark sectors
• Search for the isospin-violating decays ${\mathbf{\chi }}_{\mathbf{cJ}}\to \mathbf{\Lambda }{\bar{\mathbf{\Sigma }}}^0+\mathbf{c}.\mathbf{c}.$ and ${\mathbf{\eta }}_{\mathbf{c}}\to \mathbf{\Lambda }{\bar{\mathbf{\Sigma }}}^0+\mathbf{c}.\mathbf{c}.$
• Search for sub-GeV invisible particles in inclusive decays of $J/\psi$ to $\varphi$
• Search for a dark baryon in the ${\Xi }^{-}\to {\pi }^{-}+\mathrm{invisible}$ decay