4.7 Review

Neutrino mass and mixing with discrete symmetry

Journal

REPORTS ON PROGRESS IN PHYSICS
Volume 76, Issue 5, Pages -

Publisher

IOP PUBLISHING LTD
DOI: 10.1088/0034-4885/76/5/056201

Keywords

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Funding

  1. STFC [ST/J000396/1]
  2. EU ITN [UNILHC 237920, INVISIBLES 289442]
  3. STFC [ST/J000396/1] Funding Source: UKRI
  4. Science and Technology Facilities Council [ST/J000396/1] Funding Source: researchfish

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This is a review paper about neutrino mass and mixing and flavour model building strategies based on discrete family symmetry. After a pedagogical introduction and overview of the whole of neutrino physics, we focus on the PMNS mixing matrix and the latest global fits following the Daya Bay and RENO experiments which measure the reactor angle. We then describe the simple bimaximal, tri-bimaximal and golden ratio patterns of lepton mixing and the deviations required for a non-zero reactor angle, with solar or atmospheric mixing sum rules resulting from charged lepton corrections or residual trimaximal mixing. The different types of see-saw mechanism are then reviewed as well as the sequential dominance mechanism. We then give a mini-review of finite group theory, which may be used as a discrete family symmetry broken by flavons either completely, or with different subgroups preserved in the neutrino and charged lepton sectors. These two approaches are then reviewed in detail in separate chapters including mechanisms for flavon vacuum alignment and different model building strategies that have been proposed to generate the reactor angle. We then briefly review grand unified theories (GUTs) and how they may be combined with discrete family symmetry to describe all quark and lepton masses and mixing. Finally, we discuss three model examples which combine an SU(5) GUT with the discrete family symmetries A(4), S-4 and Delta (96).

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