Logo
ScienceStack
Table of Contents
Fetching ...
Sign In

Neutrino oscillations and rare processes in models with a small extra dimension

Stephan J. Huber, Qaisar Shafi

TL;DR

The paper analyzes Dirac neutrino masses in a Randall–Sundrum warped extra dimension with bulk SM fermions and bulk right-handed neutrinos, producing light neutrino masses through overlaps with a TeV-brane Higgs while forbidding Majorana terms via lepton number. By tuning bulk mass parameters and order-one 5D Yukawas, it demonstrates that atmospheric and solar neutrino data can be fitted, including both small and large mixing angle MSW scenarios, with near-bimaximal mixing achievable. It further evaluates rare processes, finding neutron–antineutron oscillations potential near current bounds and lepton-flavor violation in the μ→eγ channel to be typically below experimental sensitivities, though certain localizations could push them closer to detection. The work links hierarchy stabilization, flavor hierarchies, and neutrino phenomenology in a testable extra-dimensional framework with KK states around 10 TeV.

Abstract

We discuss Dirac neutrino masses and mixings in a scenario where both the standard model fermions and right handed neutrinos are bulk fields in a non-factorizable geometry in five dimensions. We show how the atmospheric and solar neutrino anomalies can be satisfactorily resolved, and in particular how bimaximal mixing is realized. We also consider rare processes such as neutron-antineutron oscillations and mu --> e + gamma, which may occur at an observable rate.

Neutrino oscillations and rare processes in models with a small extra dimension

TL;DR

The paper analyzes Dirac neutrino masses in a Randall–Sundrum warped extra dimension with bulk SM fermions and bulk right-handed neutrinos, producing light neutrino masses through overlaps with a TeV-brane Higgs while forbidding Majorana terms via lepton number. By tuning bulk mass parameters and order-one 5D Yukawas, it demonstrates that atmospheric and solar neutrino data can be fitted, including both small and large mixing angle MSW scenarios, with near-bimaximal mixing achievable. It further evaluates rare processes, finding neutron–antineutron oscillations potential near current bounds and lepton-flavor violation in the μ→eγ channel to be typically below experimental sensitivities, though certain localizations could push them closer to detection. The work links hierarchy stabilization, flavor hierarchies, and neutrino phenomenology in a testable extra-dimensional framework with KK states around 10 TeV.

Abstract

We discuss Dirac neutrino masses and mixings in a scenario where both the standard model fermions and right handed neutrinos are bulk fields in a non-factorizable geometry in five dimensions. We show how the atmospheric and solar neutrino anomalies can be satisfactorily resolved, and in particular how bimaximal mixing is realized. We also consider rare processes such as neutron-antineutron oscillations and mu --> e + gamma, which may occur at an observable rate.

Paper Structure

This paper contains 6 sections, 16 equations, 1 figure.

Table of Contents

  1. Introduction
  2. Bulk fermions
  3. Neutrino masses
  4. Numerical results
  5. Rare processes
  6. Conclusions

Figures (1)

  • Figure 1: Localization of the electron, $\tau$ and $\psi_1$ zero modes, and the first KK state of the $\tau$ in the extra dimension for the parameters of eq. (\ref{['SMSW']}).