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Search for mirror hidden sector with neutral kaons at NA64
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abstract
Mirror matter from the dark hidden sector with the same particle content and gauge interactions as in the standard model is still an interesting candidate for dark matter. Several experiments on search for positronium and neutron oscillations into their mirror partner have been conducted recently. In this work we consider the transitions $K^0-K^0_m$ of a neutral kaon into a hidden mirror kaon. It is shown that their probability can be probed with the sensitivity of $P(K^0-K^0_m )\lesssim 10^{-7}$ from the search for missing-energy events in the NA64 experiment at the CERN SPS with $\sim 10^{11}$ $K^+$ on target.This would result in a limit on the $K^0-K^0_m$ mixing parameter much stronger than the similar bound estimated from the cosmological considerations.
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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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