Constraining Non-Standard Interactions of the Neutrino with Borexino

TL;DR

This paper uses Borexino data to set limits on non-standard neutrino-electron interactions, considering solar neutrino flux uncertainties and backgrounds, with potential for improved constraints in future phases.

Contribution

It provides new constraints on non-standard neutrino interactions using Borexino data, accounting for background and flux uncertainties, and discusses future improvements.

Findings

Bounds are comparable to existing experimental limits.

Background reduction in future Borexino phases can improve constraints.

Analysis incorporates solar neutrino flux uncertainties.

Abstract

We use the Borexino 153.6 ton.year data to place constraints on non-standard neutrino-electron interactions, taking into account the uncertainty in the 7Be solar neutrino flux, and backgrounds due to 85Kr and 210Bi beta-decay. We find that the bounds are comparable to existing bounds from all other experiments. Further improvement can be expected in Phase II of Borexino due to the reduction in the 85Kr background.