Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 5, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP05(2019)169
Keywords
Beyond Standard Model; Neutrino Physics; Solar and Atmospheric Neutrinos
Categories
Funding
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [674896]
- European Union's Horizon 2020 research and innovation programme under the InvisiblesPlus RISE [690575]
- STFC [ST/L000296/1]
- STFC [ST/P000711/1] Funding Source: UKRI
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We consider a new Weinberg operator for neutrino mass of the form HuHdLiLj involving two different Higgs doublets H-u, H-d with opposite hypercharge, where sd is the charge conjugated doublet. It may arise from a model where the two Higgs doublets carry the same charge under a U(1) gauge group which forbids the usual Weinberg operator but allows the mixed one. The new Weinberg operator may be generated via two right-handed neutrinos oppositely charged under the U(1), which may be identified as components of a fourth vector-like family in a complete model. Such a version of the type I seesaw model, which we refer to as type Ib to distinguish it from the usual type Ia seesaw mechanism which yields the usual Weinberg operator, allows the possibility of having potentially large violations of unitarity of the leptonic mixing matrix whose bounds we explore. We also consider the relaxation of the unitarity bounds due to the further addition of a single right-handed neutrino, neutral under U(1), yielding a usual type Ia seesaw contribution.
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