Testing non-standard neutrino interactions in (anti)-electron neutrino disappearance experiments

TL;DR

This paper investigates non-standard scalar and tensor interactions in electron neutrino disappearance experiments, finding a slight preference for CP violation signals, especially from Daya Bay data, with significance around 1.7 to 2.1 sigma.

Contribution

It provides the first search for scalar and tensor non-standard interactions in electron neutrino disappearance data, revealing a potential hint of CP violation.

Findings

Slight preference for non-zero CP violation from tensor and scalar interactions.

Daya Bay low-energy data significantly contributes to the CP violation hint.

Global analysis shows a significance of ~1.7σ, increasing to ~2.1σ with medium baseline data.

Abstract

We search for scalar and tensor non-standard interactions using (anti)-electron neutrino disappearance in oscillation data. We found a slight preference for non-zero CP violation, coming from both tensor and scalar interactions. The preference for CP violation is lead by Daya Bay low-energy data with a significance that reaches $\sim1.7\sigma$ in the global analysis (and $\sim2.1\sigma$ when considering only medium baseline reactors data) compared to the standard neutrino oscillation scenario.