Lepton Number Violation in Higgs Decay at LHC

TL;DR

This paper demonstrates that the Left-Right symmetric model predicts lepton number violating Higgs decays at the LHC, providing a new way to explore heavy Majorana neutrino masses and parity restoration.

Contribution

It introduces a novel collider signature for lepton number violation via Higgs mixing with a triplet, extending the search for new physics beyond current methods.

Findings

Higgs can decay via lepton number violating channels at the LHC.

The process can probe parity restoration scale beyond existing searches.

Detailed collider analysis supports the detectability of these decays.

Abstract

We show that within the Left-Right symmetric model, lepton number violating decays of the Higgs boson can be discovered at the LHC. The process is due to the mixing of the Higgs with the triplet that breaks parity. As a result, the Higgs can act as a gateway to the origin of heavy Majorana neutrino mass. To assess the LHC reach, a detailed collider study of the same-sign di-leptons plus jets channel is provided. This process is complementary to the existing nuclear and collider searches for lepton number violation and can probe the scale of parity restoration even beyond other direct searches.