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The role of flavon cross couplings in leptonic flavour mixing

Pascoli, Silvia; Zhou, Ye-Ling

The role of flavon cross couplings in leptonic flavour mixing Thumbnail


Authors

Ye-Ling Zhou



Abstract

In models with discrete flavour symmetries, flavons are critical to realise specific flavour structures. Leptonic flavour mixing originates from the misalignment of flavon vacuum expectation values which respect different residual symmetries in the charged lepton and neutrino sectors. Flavon cross couplings are usually forbidden, in order to protect these symmetries. Contrary to this approach, we show that cross couplings can play a key role and give raise to necessary corrections to flavour-mixing patterns, including a non-zero value for the reactor angle and CP violation. For definiteness, we present two models based on A4. In the first model, all flavons are assumed to be real or pseudo-real, with 7 real degrees of freedom in the flavon sector in total. A sizable reactor angle associated with nearly maximal CP violation is achieved, and, as both originate from the same cross coupling, a sum rule results with a precise prediction for the value of the Dirac CP-violating phase. In the second model, the flavons are taken to be complex scalars, which can be connected with supersymmetric models and multi-Higgs models. The complexity properties of flavons provide new sources for generating the reactor angle. Models in this new approach introduce very few degrees of freedom beyond the Standard Model and can be more economical than those in the framework of extra dimension or supersymmetry.

Citation

Pascoli, S., & Zhou, Y. (2016). The role of flavon cross couplings in leptonic flavour mixing. Journal of High Energy Physics, 2016(06), Article 073. https://doi.org/10.1007/jhep06%282016%29073

Journal Article Type Article
Acceptance Date Jun 8, 2016
Online Publication Date Jun 13, 2016
Publication Date Jun 13, 2016
Deposit Date Jun 21, 2016
Publicly Available Date Mar 28, 2024
Journal Journal of High Energy Physics
Print ISSN 1126-6708
Publisher Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Peer Reviewed Peer Reviewed
Volume 2016
Issue 06
Article Number 073
DOI https://doi.org/10.1007/jhep06%282016%29073
Related Public URLs http://arxiv.org/abs/1604.00925

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
Open Access, © The Author(s) 2016 Article funded by SCOAP3. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.





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