Publication Date
2021
Journal or Book Title
Physical Review Letters
Abstract
We study the impact of the mixing (LR mixing) between the standard model W boson and its hypothetical, heavier right-handed parter WR on the neutrinoless double beta decay (0νββ decay) rate. Our study is done in the minimal left-right symmetric model assuming a type-II dominance scenario with charge conjugation as the left-right symmetry. We then show that the 0νββ decay rate may be dominated by the contribution proportional to this LR mixing, which at the hadronic level induces the leading-order contribution to the interaction between two pions and two charged leptons. The resulting long-range pion exchange contribution can significantly enhance the decay rate compared to previously considered short-range contributions. Finally, we find that even if future cosmological experiments rule out the inverted hierarchy for neutrino masses, there are still good prospects for a positive signal in the next generation of 0νββ decay experiments.
DOI
https://doi.org/10.1103/PhysRevLett.126.151801
Volume
126
License
UMass Amherst Open Access Policy
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Li, Gang; Ramsey-Musolf, Michael J.; and Vasquez, Juan Carlos, "Left-Right Symmetry and Leading Contributions to Neutrinoless Double Beta Decay" (2021). Physical Review Letters. 1264.
https://doi.org/10.1103/PhysRevLett.126.151801