# Neutrino Masses from the Point of View of Economy and Simplicity

## TL;DR

This paper explores the simplest and most economical mechanisms for neutrino mass generation within the Standard Model framework, emphasizing the Weinberg effective Lagrangian as a key approach.

## Contribution

It proposes that neutrino masses likely originate from mechanisms beyond the Standard Model, specifically highlighting the Weinberg effective Lagrangian as the simplest option.

## Key findings

- Weinberg effective Lagrangian is the most economical mechanism.
- Sterile neutrino anomaly resolution is crucial.
- Neutrinoless double beta decay is a key test.

## Abstract

In the framework of such basic principles as local gauge invariance, unification of the weak and electromagnetic interactions and spontaneous symmetry breaking in the Standard Model the most economical and simplest possibilities are realized. We discuss the problem of neutrino masses from the point of view of economy and simplicity. It is unlikely that neutrino masses are of the same SM origin as masses of leptons and quarks. The Weinberg effective Lagrangian is the simplest and the most economical, beyond the Standard Model mechanism of the generation of small Majorana neutrino masses. The resolution of the sterile neutrino anomaly and observation of the neutrinoless double $\beta$-decay would be crucial tests of this mechanism.