Short-Baseline Electron Neutrino Oscillation Length After Troitsk

TL;DR

This paper analyzes recent Troitsk bounds and other experimental data to constrain short-baseline electron neutrino oscillations within a 3+1 mixing scheme, suggesting observable effects in upcoming experiments.

Contribution

It provides a combined analysis of Troitsk data with other experiments to narrow down the neutrino mass-squared difference range and discusses implications for future experiments and neutrinoless double-beta decay.

Findings

Allowed neutrino mass-squared difference range: 0.85 to 43 eV^2

Oscillations likely observable in radioactive source experiments

Favorable conditions for ICARUS@CERN to detect oscillations

Abstract

We discuss the implications for short-baseline electron neutrino disappearance in the 3+1 mixing scheme of the recent Troitsk bounds on the mixing of a neutrino with mass between 2 and 100 eV. Considering the Troitsk data in combination with the results of short-baseline nu_e and antinu_e disappearance experiments, which include the reactor and Gallium anomalies, we derive a 2 sigma allowed range for the effective neutrino squared-mass difference between 0.85 and 43 eV^2. The upper bound implies that it is likely that oscillations in distance and/or energy can be observed in radioactive source experiments. It is also favorable for the ICARUS@CERN experiment, in which it is likely that oscillations are not washed-out in the near detector. We discuss also the implications for neutrinoless double-beta decay.