Short-Baseline Electron Neutrino Disappearance at a Neutrino Factory

TL;DR

This paper proposes a robust experimental setup at a neutrino factory for detecting short-baseline electron neutrino disappearance, capable of testing neutrino oscillation parameters and CPT violation with high sensitivity.

Contribution

It introduces a two-detector configuration at a neutrino factory that effectively cancels systematics and enhances sensitivity to neutrino oscillation parameters and CPT violation.

Findings

High sensitivity to effective mixing angle and squared-mass splitting.

Robustness against geometric and cross-section uncertainties.

Potential to test CPT invariance violation up to 0.1%.

Abstract

We discuss short-baseline and very-short-baseline electron neutrino disappearance at a neutrino factory. We take into account geometric effects, such as from averaging over the decay straights, and the uncertainties of the cross sections. We follow an approach similar to reactor experiments with two detectors: we use two sets of near detectors at different distances to cancel systematics. We demonstrate that such a setup is very robust with respect to systematics, and can have excellent sensitivities to the effective mixing angle and squared-mass splitting. In addition, we allow for CPT invariance violation, which can be tested (depending on the parameters) up to a 0.1% level.