A neutrino data analysis of extra-dimensional theories with massive bulk fields

TL;DR

This paper conducts a comprehensive neutrino oscillation analysis to test models with extra dimensions and bulk neutrino masses, constraining their parameters based on current experimental data.

Contribution

It provides the first combined analysis of large extra dimension models with bulk neutrino masses using multiple neutrino experiments, setting new bounds on model parameters.

Findings

No evidence for extra-dimensional neutrino models was found.

Constraints on the compactification radius depend on bulk mass and Yukawa coupling assumptions.

Large bulk masses or Yukawas are strongly constrained by data.

Abstract

We present a global neutrino oscillation analysis of models with a single large extra dimension in which right-handed neutrinos possess bulk Dirac masses. Two scenarios are considered: Large Extra Dimensions with bulk masses and the Dark Dimension framework, both predicting a tower of sterile Kaluza-Klein states that mix with active neutrinos. Using data from MINOS/MINOS+, KamLAND, and Daya Bay, we perform a joint likelihood analysis. No signatures of these theories were found. Therefore, we constrain the compactification radius under different bulk mass and Yukawa coupling assumptions. Large positive bulk masses or sizable Yukawas lead to strong bounds, while small couplings or negative bulk masses remain less constrained.