Neutrino Electromagnetic Properties

TL;DR

This paper reviews the theoretical framework and experimental bounds of neutrino electromagnetic properties, including charge radii and magnetic moments, and discusses their astrophysical implications and potential connections to sterile neutrinos.

Contribution

It provides a comprehensive overview of neutrino electromagnetic form factors, their phenomenology, and recent experimental constraints, highlighting new insights into physics beyond the Standard Model.

Findings

Neutrinos can have tiny electric charges and magnetic moments beyond Standard Model predictions.

Experimental bounds place stringent limits on neutrino electromagnetic properties.

Astrophysical neutrino processes are influenced by their electromagnetic characteristics.

Abstract

Neutrinos are neutral in the Standard Model, but they have tiny charge radii generated by radiative corrections. In theories Beyond the Standard Model, neutrinos can also have magnetic and electric moments and small electric charges (millicharges). We review the general theory of neutrino electromagnetic form factors, which reduce, for ultrarelativistic neutrinos and small momentum transfers, to the neutrino charges, effective charge radii, and effective magnetic moments. We discuss the phenomenology of these electromagnetic neutrino properties and we review the existing experimental bounds. We briefly review also the electromagnetic processes of astrophysical neutrinos and the neutrino magnetic moment portal in the presence of sterile neutrinos.