# Neutrinoless Double-Beta Decays from Operator Mixing

**Authors:** J. de Vries, S. Fajfer, L. P. S. Leal, O. Sumensari, R. Zukanovich Funchal  
**arXiv:** [2608.07657](https://arxiv.org/abs/2608.07657)  
**Date:** 2026-08-07  
**Summary page:** https://www.summarizepaper.com/en/arxiv-id/2608.07657v1/

## Key points

- Thorough one-loop Renormalization Group (RG) analysis of neutrinoless double-beta decays in the Standard Model Effective Field Theory (SMEFT)
- Effective operators can have significant effects through operator mixing, despite not directly contributing at tree level
- Constraints on dimension-seven operators are most stringent from full one-loop RG evolution within SMEFT, surpassing those from meson decays
- Importance of considering contributions beyond the primary leading logarithm for dominant effects on specific operators and flavor combinations
- Insights into how neutrinoless double-beta decays are influenced by operator mixing in SMEFT
- Comprehensive understanding of underlying mechanisms of neutrinoless double-beta decays
- Contribution to advancing knowledge of neutrino physics and broader implications of effective field theories in particle physics

## Summary

The authors present a thorough one-loop Renormalization Group (RG) analysis of neutrinoless double-beta decays within the framework of the Standard Model Effective Field Theory (SMEFT). They demonstrate that certain effective operators can have significant effects through operator mixing, despite not directly contributing at tree level. By carefully considering the full one-loop RG evolution within SMEFT, they establish that these constraints are the most stringent on numerous dimension-seven operators, surpassing those derived from meson decays. The study highlights the importance of accounting for contributions beyond the primary leading logarithm, as these can have dominant effects on specific operators and flavor combinations. This research provides valuable insights into how neutrinoless double-beta decays can be influenced by operator mixing in SMEFT and showcases a comprehensive understanding of their underlying mechanisms. The findings contribute significantly to advancing our knowledge of neutrino physics and shed light on the broader implications of effective field theories in particle physics. Through their meticulous analysis and rigorous calculations, the authors enhance our understanding of neutrinoless double-beta decays and their theoretical foundations within SMEFT.