Dark Dimension Right-handed Neutrinos Confronted with Long-Baseline Oscillation Experiments

TL;DR

This paper investigates how dark extra dimension models with right-handed neutrinos affect neutrino oscillation spectra and uses long-baseline experiments to constrain these models.

Contribution

It provides the first detailed comparison of dark dimension right-handed neutrino models with T2K and NOvA data, setting new exclusion limits.

Findings

Neutrino data are compatible with standard oscillation hypothesis.

Stringent exclusion limits on extra dimension model parameters.

Constraints are complementary to collider and cosmological bounds.

Abstract

Right-handed neutrinos are naturally induced by dark extra dimension models and play an essential role in neutrino oscillations. The model parameters can be examined by the long-baseline neutrino oscillation experiments. In this work, we compute the predicted neutrino oscillation spectra within/without extra dimension models and compare them with the experimental data. We find that the neutrino data in the T2K and NOvA experiments are compatible with the standard neutrino oscillation hypothesis. The results set the stringent exclusion limit on the extra dimension model parameters at a high confidence level. The derived constraints on dark dimension right-handed neutrinos are complementary to those results from the collider experiments and cosmological observations.