Testing the seesaw mechanism at collider energies in the Randall-Sundrum model

TL;DR

This paper explores the potential to test the seesaw mechanism within the Randall-Sundrum model at collider energies by analyzing the production and spectrum of Kaluza-Klein neutrino modes, which can distinguish between Dirac and Majorana neutrinos.

Contribution

It demonstrates that collider experiments can produce first KK modes of right-handed neutrinos and determine their nature by examining the KK mass spectrum, providing a novel test of the seesaw mechanism.

Findings

KK modes of right-handed neutrinos can be produced at colliders.

The KK mass spectrum reveals whether neutrinos are Dirac or Majorana.

Collider signatures can distinguish neutrino mass types.

Abstract

The Randall-Sundrum model with gauge fields and fermions in the bulk has several attractive features including the gauge coupling unification, a candidate for the dark matter, and an explanation for the hierarchical Yukawa couplings. In this paper, we point out that the 1st Kaluza-Klein modes of right-handed neutrinos may be produced at colliders, for both Dirac and Majorana neutrino cases. Furthermore, we can see whether the neutrino masses are Dirac type or Majorana type from the mass spectrum of KK particles.