Bremsstrahlung from Neutrino Scattering via Magnetic Dipole Moments

TL;DR

This paper investigates bremsstrahlung caused by neutrino scattering through magnetic dipole moments, exploring its potential as a signature for cosmic neutrino background detection, but finds the signal too weak for observation.

Contribution

It analyzes neutrino-induced bremsstrahlung via magnetic dipole moments, highlighting the process's potential for CNB detection and its practical limitations.

Findings

Bremsstrahlung from neutrino scattering is theoretically possible.

The expected signal for CNB detection is extremely small.

Standard Model neutrino magnetic moments are too tiny for observable effects.

Abstract

In this paper we discuss bremsstrahlung induced by neutrino scattering. This process should exist since neutrinos are expected to couple to photons via magnetic dipole and transition moments. These moments are loop-induced and tiny in the Standard Model with neutrino masses but could be significantly enhanced in extended theories. As concrete example we study the scattering of the two largest neutrino fluxes on earth, solar neutrinos and Cosmic Neutrino Background (CNB). It is tempting to consider this as a potential signature for CNB searches but it turns out that the signal is extremely small and unlikely to be observed.