The paper derives explicit element-wise relations in the Zee model, showing five entries of the Yukawa matrix Yℓ are fixed by F and mν, while four remain free, and applies this to texture B2 with muon g-2.
The Singly-Charged Scalar Singlet as the Origin of Neutrino Masses
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abstract
We consider the generation of neutrino masses via a singly-charged scalar singlet. Under general assumptions we identify two distinct structures for the neutrino mass matrix. This yields a constraint for the antisymmetric Yukawa coupling of the singly-charged scalar singlet to two left-handed lepton doublets, irrespective of how the breaking of lepton-number conservation is achieved. The constraint disfavours large hierarchies among the Yukawa couplings. We study the implications for the phenomenology of lepton-flavour universality, measurements of the $W$-boson mass, flavour violation in the charged-lepton sector and decays of the singly-charged scalar singlet. We also discuss the parameter space that can address the Cabibbo Angle Anomaly.
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Structure of leptonic Yukawa couplings in the Zee model
The paper derives explicit element-wise relations in the Zee model, showing five entries of the Yukawa matrix Yℓ are fixed by F and mν, while four remain free, and applies this to texture B2 with muon g-2.