Discrete Dirac Neutrino in Warped Extra Dimensions

TL;DR

This paper proposes a model embedding Dirac neutrinos in a warped extra dimension framework, naturally reproducing lepton masses and mixings, predicting a nonzero $ heta_{13}$, and suggesting potential LHC signatures from light KK neutrinos.

Contribution

It introduces a minimal custodial Randall-Sundrum model implementing Dirac neutrinos via the Krauss-Wilczek mechanism, aligning with experimental constraints and predicting observable KK neutrinos.

Findings

Reproduces lepton mass and mixing patterns naturally

Predicts a nonzero neutrino mixing angle $ heta_{13}$

Suggests sub-TeV KK neutrinos detectable at the LHC

Abstract

We implement Dirac neutrinos in the minimal custodial Randall-Sundrum setting via the Krauss-Wilczek mechanism. We demonstrate by giving explicit lepton mass matrices that with neutrinos in the normal hierarchy, lepton mass and mixing patterns can be naturally reproduced at the scale set by the constraints from electroweak precision measurements, and at the same time without violating bounds set by lepton flavour violations. Our scenario generically predicts a nonzero neutrino mixing angle $\theta_{13}$, as well as the existence of sub-TeV right-handed Kaluza-Klein neutrinos, which partner the right-handed Standard Model charged leptons. These relatively light KK neutrinos may be searched for at the LHC.