Neutrino non-standard interactions as a portal to test flavour symmetries

Abstract

Imposing non-Abelian discrete flavour symmetries to neutrino non-standard interactions (NSIs) is discussed for the first time. For definiteness, we choose $A_4$ as the flavour symmetry, which is subsequently broken to the residual symmetry $Z_2$ in the neutrino sector. We provide a general discussion on flavour structures of NSIs from higher-dimensional operators ($d⩽8$) without inducing unnecessary tree-level 4-charged-fermion interactions. Both $A_4$- and $Z_2$-motivated NSI textures are obtained. UV completions of higher-dimensional operators lead to extra experimental constraints on NSI textures. We study the implementation of matter-effect NSIs in DUNE from phenomenological point of view, and discover that DUNE can test $A_4$ with a high level of statistics. We also present exclusion limits of sum rules suggested by UV-complete models. Our result shows that the NSI effects, though predicted to be small for DUNE, could provide useful information that might extend our understanding of the flavour symmetry.

41 pages, 6 figures, 13 tables, discussions and references added, published in PRD

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Cited by in corpus (6)

• Non-Standard Neutrino Interactions and Neutral Gauge Bosons
• Correlations and degeneracies among the NSI parameters with tunable beams at DUNE
• Nonstandard neutrino interactions and mu-tau reflection symmetry
• Non-standard interactions versus planet-scale neutrino oscillations
• Confronting Tri-direct CP-symmetry models to neutrino oscillation experiments
• Constraining $A_4$ Leptonic Flavour Model Parameters at Colliders and Beyond