Light new physics and neutrino electromagnetic interactions in XENONnT

TL;DR

This paper uses XENONnT data to set new, more stringent limits on neutrino electromagnetic properties and light mediator interactions, enhancing our understanding of neutrino physics beyond the Standard Model.

Contribution

The study extends previous analyses by deriving comprehensive constraints on neutrino electromagnetic interactions and light gauge bosons using the latest XENONnT data.

Findings

Improved limits on neutrino magnetic moment by about tenfold.

Stronger constraints on neutrino millicharge and light vector/scalar mediators.

Weaker improvements observed for neutrino charge radii and anapole moments.

Abstract

We derive new limits on the neutrino electromagnetic interactions and weakly coupled light vector and scalar mediators using the recent XENONnT data of the solar neutrino-electron elastic scattering. XENONnT has already reported the world's best constraint on the flavor-independent effective neutrino magnetic moment with almost twice the exposure and improved systematics. We extend this analysis and derive constraints on all the possible electromagnetic interactions and flavor universal light gauge boson couplings and masses, which could contribute to the neutrino-electron elastic scattering process. We consider both flavor-independent and flavor-dependent interactions of the neutrino magnetic moments, millicharges, charge radii, and anapole moments for the electromagnetic interactions. The new limits on the magnetic moment, millicharge, vector, and scalar interactions are improved by about one order of magnitude. At the same time, there is relatively weaker improvement in the case of neutrino charge radii and anapole moments.