Left-Right Symmetry and Leading Contributions to Neutrinoless Double Beta Decay.
Phys Rev Lett
; 126(15): 151801, 2021 Apr 16.
Article
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| MEDLINE
| ID: mdl-33929232
ABSTRACT
We study the impact of the mixing (LR mixing) between the standard model W boson and its hypothetical, heavier right-handed parter W_{R} on the neutrinoless double beta decay (0νßß 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 0νßß 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 0νßß decay experiments.
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MEDLINE
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En
Revista:
Phys Rev Lett
Año:
2021
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Article
País de afiliación:
Estados Unidos