Sizable NSI from the $SU(2{)}_L$ scalar doublet-singlet mixing and the implications in DUNE

Abstract

We propose a novel and simple mechanism where sizable effects of non-standard interactions (NSI) in neutrino propagation are induced from the mixing between an electrophilic second Higgs doublet and a charged singlet. The mixing arises from a dimensionful coupling of the scalar doublet and singlet to the standard model Higgs boson. In light of the small mass, the light mass eigenstate from the doublet-singlet mixing can generate much larger NSI than those induced by the heavy eigenstate. We show that a sizable NSI ${\epsilon }_{e\tau }$ ($\sim 0.3$) can be attained without being excluded by a variety of experimental constraints. Furthermore, we demonstrate that NSI can mimic effects of the Dirac CP phase in the neutrino mixing matrix but they can potentially be disentangled by future long-baseline neutrino experiments, such as the Deep Underground Neutrino Experiment (DUNE).

21 pages, 3 figures. V3: version accepted by JHEP

References in corpus (2)

• Measurements of neutrino oscillation in appearance and disappearance channels by the T2K experiment with 6.6E20 protons on target
• General bounds on non-standard neutrino interactions

Cited by in corpus (8)

• Snowmass White Paper: Beyond the Standard Model effects on Neutrino Flavor
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• New reactor data improves robustness of neutrino mass ordering determination
• DUNE potential as a New Physics probe
• Constraining non-standard neutrino interactions with neutral current events at long-baseline oscillation experiments
• Constraining nonstandard neutrino interactions at electron colliders
• Testing the dark side of neutrino oscillations with the solar neutrino fog at Dark Matter experiments