A Brane-World Explanation of the KARMEN Anomaly

TL;DR

This paper proposes a six-dimensional brane-world model to explain the KARMEN anomaly, alleviating fine-tuning issues and offering new insights into neutrino physics in higher-dimensional frameworks.

Contribution

It introduces a novel six-dimensional brane-world model that explains the KARMEN anomaly and decouples brane-bulk mixing from neutrino oscillation scales.

Findings

The KARMEN anomaly can be explained within a six-dimensional brane-world framework.

Fine-tuning problems are alleviated in this model.

Brane-bulk mixing decouples from atmospheric and solar neutrino scales.

Abstract

Motivated by the anomaly in the KARMEN experiment, we study new possibilities for brane-world models of neutrino masses. We show that the KARMEN anomaly can be understood in the context of a six-dimensional brane-world model. The fine-tuning problem associated with the single-particle interpretation of the anomaly is thereby alleviated. Our model shows some interesting properties of general interest for brane-world neutrino physics. In particular, the size of the brane-bulk mixing decouples from the scales relevant for atmospheric and solar neutrino oscillations.