No evidence found for invisible particle X in K_L^0 to gamma X; upper limits set at 3.4e-7 for massless case and O(10^{-7}) to O(10^{-3}) for masses up to 425 MeV/c^2 at 90% CL.
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Search for Dark Particles in $K^0_L \to \gamma X$ at the KOTO Experiment
No evidence found for invisible particle X in K_L^0 to gamma X; upper limits set at 3.4e-7 for massless case and O(10^{-7}) to O(10^{-3}) for masses up to 425 MeV/c^2 at 90% CL.