Invisible K L decays as a probe of new physics

@article{Gninenko2015InvisibleKL,
  title={Invisible K L decays as a probe of new physics},
  author={Sergei Gninenko and N. V. Krasnikov},
  journal={Physical Review D},
  year={2015},
  volume={92},
  pages={034009}
}
The decay ${K}_{L}\ensuremath{\rightarrow}\mathit{\text{invisible}}$ has never been experimentally tested. In the Standard Model (SM), its branching ratio for the decay into two neutrinos is helicity suppressed and predicted to be $\mathrm{Br}({K}_{L}\ensuremath{\rightarrow}\ensuremath{\nu}\overline{\ensuremath{\nu}})\ensuremath{\lesssim}{10}^{\ensuremath{-}10}$. We consider several natural extensions of the SM, such as two-Higgs-doublet (2HDM), 2HDM and light scalar, and mirror dark matter… 
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