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Unified models of neutrinos, flavour and CPCP violation

Unified models of neutrinos, flavour and CPCP violation
Unified models of neutrinos, flavour and CPCP violation
Recent data from neutrino experiments gives intriguing hints about the mass ordering, the violating phase and non-maximal atmospheric mixing. There seems to be a (one sigma) preference for a normal ordered (NO) neutrino mass pattern, with a phase , and (more significantly) non-maximal atmospheric mixing. Global fits for the NO case yield lepton mixing angle one sigma ranges: , , . Cosmology gives a limit on the total of the three masses to be below about 0.23 eV, favouring hierarchical neutrino masses over quasi-degenerate masses. Given such experimental advances, it seems an opportune moment to review the theoretical status of attempts to explain such a pattern of neutrino masses and lepton mixing, focusing on approaches based on the four pillars of: predictivity, minimality, robustness and unification. Predictivity can result from various mixing sum rules whose status is reviewed. Minimality can follow from the type I seesaw mechanism, including constrained sequential dominance of right-handed (RH) neutrinos, and the littlest seesaw model. Robustness requires enforcing a discrete and non-Abelian family symmetry, spontaneously broken by flavons with the symmetry preserved in a semi-direct way. Unification can account for all lepton and quark masses, mixing angles and phases, as in Supersymmetric Grand Unified Theories of Flavour, with possible string theory origin.
0146-6410
217-256
King, Stephen
f8c616b7-0336-4046-a943-700af83a1538
King, Stephen
f8c616b7-0336-4046-a943-700af83a1538

King, Stephen (2017) Unified models of neutrinos, flavour and CPCP violation. Progress in Particle and Nuclear Physics, 94, 217-256. (doi:10.1016/j.ppnp.2017.01.003).

Record type: Article

Abstract

Recent data from neutrino experiments gives intriguing hints about the mass ordering, the violating phase and non-maximal atmospheric mixing. There seems to be a (one sigma) preference for a normal ordered (NO) neutrino mass pattern, with a phase , and (more significantly) non-maximal atmospheric mixing. Global fits for the NO case yield lepton mixing angle one sigma ranges: , , . Cosmology gives a limit on the total of the three masses to be below about 0.23 eV, favouring hierarchical neutrino masses over quasi-degenerate masses. Given such experimental advances, it seems an opportune moment to review the theoretical status of attempts to explain such a pattern of neutrino masses and lepton mixing, focusing on approaches based on the four pillars of: predictivity, minimality, robustness and unification. Predictivity can result from various mixing sum rules whose status is reviewed. Minimality can follow from the type I seesaw mechanism, including constrained sequential dominance of right-handed (RH) neutrinos, and the littlest seesaw model. Robustness requires enforcing a discrete and non-Abelian family symmetry, spontaneously broken by flavons with the symmetry preserved in a semi-direct way. Unification can account for all lepton and quark masses, mixing angles and phases, as in Supersymmetric Grand Unified Theories of Flavour, with possible string theory origin.

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king_revised_2 - Accepted Manuscript
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Accepted/In Press date: 13 January 2017
e-pub ahead of print date: 27 January 2017
Organisations: Theory Group

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Local EPrints ID: 407387
URI: http://eprints.soton.ac.uk/id/eprint/407387
ISSN: 0146-6410
PURE UUID: 073da784-0f22-4419-982e-80c40bdd6353

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Date deposited: 05 Apr 2017 01:06
Last modified: 06 Oct 2020 16:38

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