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Search for $K_{S,L}$ oscillations and invisible decays into the dark sector at NA64
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abstract
The decays $K_{S,L}$ have never been experimentally tested. In the Standard Model their branching ratios for the decay into two neutrinos are predicted to be extremely small, $Br(K_{S,L} \to \nu \bar{\nu}) \lesssim 10^{-16}$. We consider several natural extensions of the SM, such as two-Higgs-doublet (2HDM), 2HDM and light scalar, and dark mirror sector models, that allow to enhance the $Br(K_{S,L})$ up to a measurable level. We briefly discuss the possible search for $K_{S,L}$ decays and $K_{S,L}$ oscillations into the dark sector at the NA64 experiment at CERN with the sensitivity to $Br(K_{S,L}) \lesssim 10^{-7}-10^{-5}$.
Forward citations
Cited by 2 Pith papers
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Probing Light Dark Particles in Neutrino Scattering Experiments
A dark fermion produced in neutrino scattering could be probed at DUNE's near detector up to cutoff scales near 1 TeV, beyond CHARM II and LEP, while current COHERENT/CONUS+ limits stay below LHC bounds.
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Searching for Light Dark Matter and Dark Sectors with the NA64 experiment at the CERN SPS
NA64 reports that its missing-energy technique has set leading limits on light dark matter, and that planned upgrades could discover or exclude several dark-sector models.
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