Search for $K_{S,L}$ oscillations and invisible decays into the dark sector at NA64
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| Format: | Preprint |
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2025
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| _version_ | 1866918054177275904 |
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| author | Gninenko, S. N. Krasnikov, N. V. Matveev, V. A. |
| author_facet | Gninenko, S. N. Krasnikov, N. V. Matveev, V. A. |
| contents | 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, $Br(K_{S,L} \to ν\barν) \lesssim 10^{-16}$. 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 $Br(K_{S,L}) \lesssim 10^{-7}-10^{-5}$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_09772 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Search for $K_{S,L}$ oscillations and invisible decays into the dark sector at NA64 Gninenko, S. N. Krasnikov, N. V. Matveev, V. A. High Energy Physics - Phenomenology High Energy Physics - Experiment 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, $Br(K_{S,L} \to ν\barν) \lesssim 10^{-16}$. 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 $Br(K_{S,L}) \lesssim 10^{-7}-10^{-5}$. |
| title | Search for $K_{S,L}$ oscillations and invisible decays into the dark sector at NA64 |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2501.09772 |