In the BNT neutrino mass model the electroweak vacuum is not generically the global minimum, with stability reducible to two mass inequalities when the quadruplet vev vanishes.
Electroweak interactions and high-energy limit
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abstract
A pedagogical introduction to the equivalence theorem for longitudinal vector bosons in electroweak theories is presented and the problem of high-energy behaviour of scattering amplitudes in the Standard Model is briefly reviewed. To make the treatment self-contained, the basics of the Standard Model are summarized in an appendix.
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Vacuum structure of the Babu-Nandi-Tavartkiladze model of neutrino mass generation
In the BNT neutrino mass model the electroweak vacuum is not generically the global minimum, with stability reducible to two mass inequalities when the quadruplet vev vanishes.