COHERENT constraints to conventional and exotic neutrino physics

TL;DR

This paper updates constraints on neutrino physics using COHERENT experiment data, exploring Standard Model extensions, nonstandard interactions, electromagnetic properties, sterile neutrinos, and new bosons.

Contribution

It provides new bounds on various beyond-Standard Model neutrino interactions and properties based on recent experimental data.

Findings

Constraints on nonstandard neutrino interactions are tightened.

Limits on neutrino magnetic moment and charge radius are improved.

Excluded parameter regions for sterile neutrinos and new bosons are identified.

Abstract

The process of neutral-current coherent elastic neutrino-nucleus scattering, consistent with the Standard Model (SM) expectation, has been recently measured by the COHERENT experiment at the Spallation Neutron Source. On the basis of the observed signal and our nuclear calculations for the relevant Cs and I isotopes, the extracted constraints on both conventional and exotic neutrino physics are updated. The present study concentrates on various SM extensions involving vector and tensor nonstandard interactions as well as neutrino electromagnetic properties, with an emphasis on the neutrino magnetic moment and the neutrino charge radius. Furthermore, models addressing a light sterile neutrino state and scenarios with new propagator fields---such as vector $Z^\prime$ and scalar bosons---are examined, and the corresponding regions excluded by the COHERENT experiment are presented.