Generalized Neutrino Interactions: constraints and parametrizations

TL;DR

This paper analyzes generalized neutrino interactions, comparing parametrizations and experimental bounds from CEvNS and deep-inelastic scattering, highlighting the complementarity of different experimental scales.

Contribution

It clarifies the relationship between common GNI parametrizations and compares experimental constraints from different scattering experiments.

Findings

Scalar interactions are better constrained by low-energy experiments like COHERENT.

Tensor interactions are more robustly constrained from deep inelastic scattering.

The study demonstrates the complementarity of different experimental approaches for GNI constraints.

Abstract

Generalized neutrino interactions (GNI) are emerging as a convenient framework for describing effective scalar, vector, and tensor interactions. Such interactions arise naturally from extensions of the Standard Model that aim to explain neutrino properties and their mass origin. In this paper, we carefully study the two more common parametrizations for GNI and how to relate them. This allows us to compare bounds obtained from CEvNS and deep-inelastic scattering under the same footing. In addition, we present the current bounds from CEvNS measurements by COHERENT and compare them to those obtained from deep inelastic scattering on the same level. Our results focus on neutrino-quark interactions, and illustrate the complementarity between experiments working at different scales for GNI, showing that scalar interactions are better constrained by low-energy experiments like COHERENT, while tensor interactions are robustly constrained from deep inelastic scattering.