Large Extra Dimensions and neutrino experiments

TL;DR

This paper investigates how large extra dimensions could influence neutrino experiments, analyzing data from multiple sources to set bounds on the size of these extra dimensions and explore explanations for anomalies.

Contribution

It provides the first comprehensive analysis of neutrino data in the context of large extra dimensions, deriving new bounds on their size from current experiments.

Findings

Gallium anomaly can be explained by large extra dimensions but is in tension with other data.

Current experiments constrain the size of extra dimensions to less than 0.20 μm (normal ordering) and 0.10 μm (inverted ordering).

Analysis of KATRIN data sets new bounds on the size of large extra dimensions.

Abstract

The existence of Large Extra Dimensions can be probed in various neutrino experiments. We analyze several neutrino data sets in a model with a dominant large extra dimension. We show that the Gallium anomaly can be explained with neutrino oscillations induced by the large extra dimension, but the region of parameter space which is preferred by the Gallium anomaly is in tension with the bounds from reactor rate data, as well as the data of Daya Bay and MINOS. We also present bounds obtained from the analysis of the KATRIN data. We show, that current experiments can put strong bounds on the size $R_{\text{ED}}$ of the extra dimension: $R_{\text{ED}} < 0.20~\mu\text{m}$ and $R_{\text{ED}} < 0.10~\mu\text{m}$ at 90\% C.L. for normal and inverted ordering of the standard neutrino masses, respectively.