Testing a Neutrino Mass Generation Mechanism at the Large Hadron Collider

TL;DR

This paper explores how the Large Hadron Collider can test the neutrino mass pattern and Majorana nature through specific Higgs boson decays in a Type II seesaw model, offering potential experimental signatures.

Contribution

It proposes a method to identify neutrino mass features and Majorana phases via charged Higgs decays, advancing experimental tests of neutrino mass models at colliders.

Findings

Identification of flavor structure in lepton number violating decays

Robust determination of neutrino spectra independent of Majorana phases

Signatures of triplet-doublet mixing and triplet nature of Higgs field

Abstract

The Large Hadron Collider could be a discovery machine for the neutrino mass pattern and its Majorana nature in the context of a well-motivated TeV scale Type II seesaw model. This is achieved by identifying the flavor structure of the lepton number violating decays of the charged Higgs bosons. The observation of either H^+ --> tau^+ nubar or H^+ --> e^+ nubar will be particularly robust to determine the neutrino spectra since they are independent of the unknown Majorana phases, which could be probed via the H^{++} --> e^+_i e^+_j decays. In a less favorable scenario when the leptonic channels are suppressed, one needs to observe the decays H^+ --> W^+ H_1, and H^+ --> t bbar to confirm the triplet-doublet mixing that implies the Type II relation. The associated production H^{++} H^{-} is crucial in order to test the triplet nature of the Higgs field.