# Non-standard Neutrino Interactions

## TL;DR

This paper reviews the current understanding of Non-Standard Neutrino Interactions (NSIs) within the framework of effective field theory, emphasizing gauge invariance constraints and providing examples of viable models.

## Contribution

It offers a comprehensive review of NSIs considering Standard Model gauge symmetry constraints and introduces new gauge-invariant models of non-standard interactions.

## Key findings

- Gauge invariance imposes strict restrictions on NSI models
- Examples of gauge-invariant NSI models are provided
- Current status of NSI theories is summarized

## Abstract

Theories beyond the Standard Model must respect its gauge symmetry. This implies strict constraints on the possible models of Non-Standard Neutrino Interactions (NSIs). We review here the present status of NSIs from the point of view of effective field theory. Our recent work on the restrictions implied by Standard Model gauge invariance is provided along with some examples of possible gauge invariant models featuring non-standard interactions.