Abstract
The particle spectrum of all Majorana neutrino mass models with spontaneous violation of global lepton number include a Goldstone boson, the so-called majoron. The presence of this massless pseudoscalar changes the phenomenology dramatically. In this work we derive general analytical expressions for the 1-loop coupling of the majoron to charged leptons. These can be applied to any model featuring a majoron that have a clear hierarchy of energy scales, required for an expansion in powers of the low-energy scale to be valid. We show how to use our general results by applying them to some example models, finding full agreement with previous results in several popular scenarios and deriving novel ones in other setups.
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Acknowledgments
The authors are grateful to Salvador Centelles Chuliá for discussions. Work supported by the Spanish grants PID2020-113775GB-I00 (AEI/10.13039/501100011033) and CIPROM/2021/054 (Generalitat Valenciana). The work of AHB is supported by the grant No. CIACIF/2021/100 (also funded by Generalitat Valenciana). AV acknowledges financial support from MINECO through the Ramón y Cajal contract RYC2018-025795-I.
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Herrero-Brocal, A., Vicente, A. The majoron coupling to charged leptons. J. High Energ. Phys. 2024, 78 (2024). https://doi.org/10.1007/JHEP01(2024)078
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DOI: https://doi.org/10.1007/JHEP01(2024)078