Feasibility Study of Lepton Number Violation in Rare $B$ and $K$ Meson Decays
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866911393479917568 |
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| author | Endo, Motoi Fridell, Kåre Iwamoto, Sho Mura, Yushi Yamamoto, Kei |
| author_facet | Endo, Motoi Fridell, Kåre Iwamoto, Sho Mura, Yushi Yamamoto, Kei |
| contents | We study lepton-number-violating interactions at dimension seven in the Standard Model effective field theory that contribute to the meson decays $B \to K νν$ and $K \to πνν$. Such interactions could washout the baryon asymmetry of the Universe and also contribute to the neutrinoless double beta decay, even though the interactions involve a change in down-type quark flavors. We clarify conditions under which excesses in meson decay rates over the Standard Model predictions can be successfully observed. We also show that, although these interactions contribute to neutrino masses at the two-loop level, the Weinberg operator can be introduced consistently without spoiling the scenario. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2601_16422 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Feasibility Study of Lepton Number Violation in Rare $B$ and $K$ Meson Decays Endo, Motoi Fridell, Kåre Iwamoto, Sho Mura, Yushi Yamamoto, Kei High Energy Physics - Phenomenology We study lepton-number-violating interactions at dimension seven in the Standard Model effective field theory that contribute to the meson decays $B \to K νν$ and $K \to πνν$. Such interactions could washout the baryon asymmetry of the Universe and also contribute to the neutrinoless double beta decay, even though the interactions involve a change in down-type quark flavors. We clarify conditions under which excesses in meson decay rates over the Standard Model predictions can be successfully observed. We also show that, although these interactions contribute to neutrino masses at the two-loop level, the Weinberg operator can be introduced consistently without spoiling the scenario. |
| title | Feasibility Study of Lepton Number Violation in Rare $B$ and $K$ Meson Decays |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2601.16422 |