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Left-Right Symmetry and Leading Contributions to Neutrinoless Double Beta Decay.

Left-Right Symmetry and Leading Contributions to Neutrinoless Double Beta Decay.

Authors :
Li G
Ramsey-Musolf MJ
Vasquez JC
Source :
Physical review letters [Phys Rev Lett] 2021 Apr 16; Vol. 126 (15), pp. 151801.
Publication Year :
2021

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 (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.

Details

Language :
English
ISSN :
1079-7114
Volume :
126
Issue :
15
Database :
MEDLINE
Journal :
Physical review letters
Publication Type :
Academic Journal
Accession number :
33929232
Full Text :
https://doi.org/10.1103/PhysRevLett.126.151801