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Natural vacuum alignment from group theory: the minimal case

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Abstract

Discrete flavour symmetries have been proven successful in explaining the leptonic flavour structure. To account for the observed mixing pattern, the flavour symmetry has to be broken to different subgroups in the charged and neutral lepton sector. However, cross-couplings via non-trivial contractions in the scalar potential force the group to break to the same subgroup. We present a solution to this problem by extending the flavour group in such a way that it preserves the flavour structure, but leads to an ’accidental’ symmetry in the flavon potential.

We have searched for symmetry groups up to order 1000, which forbid all dangerous cross-couplings and extend one of the interesting groups A 4, T 7, S 4, T′ or Δ(27). We have found a number of candidate groups and present a model based on one of the smallest extensions of A 4, namely \( {{Q}_8} \rtimes {{A}_4} \). We show that the most general nonsupersymmetric potential allows for the correct vacuum alignment. We investigate the effects of higher dimensional operators on the vacuum configuration and mixing angles, and give a see-saw-like UV completion. Finally, we discuss the supersymmetrization of the model. Additionally, we release the Mathematica package Discrete providing various useful tools for model building such as easily calculating invariants of discrete groups and flavon potentials.

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Authors and Affiliations

  1. Max-Planck Institut für Kernphysik, Saupfercheckweg 1, 69117, Heidelberg, Germany

    Martin Holthausen

  2. Institute for Particle Physics Phenomenology (IPPP), University of Durham, Durham, DH1 3LE, U.K.

    Michael A. Schmidt

  3. ARC Centre of Excellence for Particle Physics at the Terascale, School of Physics, The University of Melbourne, Victoria, 3010, Australia

    Michael A. Schmidt

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  1. Martin Holthausen
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Holthausen, M., Schmidt, M.A. Natural vacuum alignment from group theory: the minimal case. J. High Energ. Phys. 2012, 126 (2012). https://doi.org/10.1007/JHEP01(2012)126

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