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PreprintCC BY 4.0arXiv

Flavorful Lepton-Number-Violating SMEFT: Loop Mixing, 0νββ and Rare Meson Decays

  • Lukáš Gráf
  • Chandan Hati
  • Ana Martín-Galán
  • Oliver Scholer
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Abstract

We investigate how one-loop operator mixing reshapes the flavor sensitivity of lepton-number-violating dimension-7 SMEFT interactions. Using both bottom-up and top-down EFT approaches, we study the interplay of neutrinoless double beta decay (0νββ) and neutral current rare meson decays K→πνν, and B→ K(*)νν, which at tree level probe apparently disconnected quark- and lepton-flavor sectors. We show that loop mixing qualitatively changes this picture: flavor structures radiatively feed into one another, substantially extending the sensitivity to higher new-physics scales across operators and flavors. In the bottom-up EFT approach, this can make 0νββ highly sensitive even to operators involving heavier-generation quarks, while rare kaon and B decays retain crucial complementary sensitivity to other flavor combinations. A top-down EFT approach example using a ultraviolet model involving scalar-leptoquark illustrates how the same effects can reorder the relative importance of different observables.

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Cite

BibTeXRIS
BibTeX
@misc{graf2026flavorful,
  title = {{Flavorful Lepton-Number-Violating SMEFT: Loop Mixing, $0νββ$ and Rare Meson Decays}},
  author = {Lukáš Gráf and Chandan Hati and Ana Martín-Galán and Oliver Scholer},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.28382},
  eprint = {2609.28382},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.28382},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Flavorful Lepton-Number-Violating SMEFT: Loop Mixing, 0νββ and Rare Meson Decays
AU  - Lukáš Gráf
AU  - Chandan Hati
AU  - Ana Martín-Galán
AU  - Oliver Scholer
PY  - 2026
DA  - 2026/09/23
PB  - arXiv
DO  - 10.48550/arxiv.2609.28382
UR  - https://arxiv.org/abs/2609.28382
AB  - We investigate how one-loop operator mixing reshapes the flavor sensitivity of lepton-number-violating dimension-7 SMEFT interactions. Using both bottom-up and top-down EFT approaches, we study the interplay of neutrinoless double beta decay (0νββ) and neutral current rare meson decays K→πνν, and B→ K^(*)νν, which at tree level probe apparently disconnected quark- and lepton-flavor sectors. We show that loop mixing qualitatively changes this picture: flavor structures radiatively feed into one another, substantially extending the sensitivity to higher new-physics scales across operators and flavors. In the bottom-up EFT approach, this can make 0νββ highly sensitive even to operators involving heavier-generation quarks, while rare kaon and B decays retain crucial complementary sensitivity to other flavor combinations. A top-down EFT approach example using a ultraviolet model involving scalar-leptoquark illustrates how the same effects can reorder the relative importance of different observables.
ER  -