Non-Standard Neutrino Interactions at One Loop

TL;DR

This paper extends the formalism of neutrino non-standard interactions to include one-loop quantum corrections, analyzing their potential impact on neutrino oscillation experiments and exploring specific models like the MSSM.

Contribution

It introduces a comprehensive framework for calculating one-loop NSIs, including vertex, wave function, mass, and box diagram corrections, and applies it to the MSSM with lepton flavor violation.

Findings

One-loop NSIs can be significant enough for experimental detection.

Loop corrections include vertex, wave function, mass, and box diagrams.

MSSM with lepton flavor violation can produce observable NSIs.

Abstract

Neutrino oscillation experiments are known to be sensitive to Non-Standard Interactions (NSIs). We extend the NSI formalism to include one-loop effects. We discuss universal effects induced by corrections to the tree level W exchange, as well as non-universal effects that can arise from scalar charged current interactions. We show how the parameters that can be extracted from the experiments are obtained from various loop amplitudes, which include vertex corrections, wave function renormalizations, mass corrections as well as box diagrams. As an illustrative example, we discuss NSIs at one loop in the Minimal Supersymmetric Standard Model (MSSM) with generic lepton flavor violating sources in the soft sector. We argue that the size of one-loop NSIs can be large enough to be probed in future neutrino oscillation experiments.