Classification of effective neutrino mass operators

Classification of Effective Neutrino Mass Operators

We present a classification of SU(3)C × SU(2)L × U(1)Y gauge invariant ∆L = 2 (L being lepton number) effective operators relevant for generating small Majorana neutrino masses. Operators of dimension up to 11 have been included in our analysis. This approach enables us to systematically identify interesting neutrino mass models. It is shown that many of the well–known models fall into this cla...

Effective Neutrino Mass Operators: A Guide to Model Building

Effective operators relevant for generating small Majorana masses for the neutrinos in the Standard Model will be considered. These operators serve as a useful guide for building models of neutrino mass. Some of these operators are represented by familiar models in the literature, and others lead to interesting new models. The number of the relevant operators will be drastically reduced if neut...

Physics of Neutrino Mass

For a long time, it was believed that neutrinos are massless, spin half particles, making them drastically different from their other standard model spin half cousins such as the charged leptons (e, μ, τ) and the quarks (u, d, s, c, t, b), which are known to have mass. In fact the masslessness of the neutrino was considered so sacred in the 1950s and 1960s that the fundamental law of weak inter...

Bounding Effective Operators at the One-Loop Level: The Case of Four-Fermion Neutrino Interactions

The contributions of non-standard four-neutrino contact interactions to electroweak observables are considered at the one-loop level by using the effective quantum field theory. The analysis is done in terms of three unknown parameters: the strength of the non-standard neutrino interactions, F̃ , an additional derivative coupling needed to renormalize the divergent contributions that appear when...

Low-Energy Neutrino Physics and Neutrino Mass