Neutrino mass and invisible Higgs decays at the LHC

TL;DR

This paper investigates how LHC data constrains invisible Higgs decays into majorons, providing insights into neutrino mass generation and spontaneous lepton number violation.

Contribution

It extends previous bounds on invisible Higgs decays using LHC results, offering new constraints on models with spontaneous lepton number breaking.

Findings

LHC data significantly restricts invisible Higgs decay rates.

Constraints on lepton number violation parameters are improved.

Results extend beyond previous LEP bounds.

Abstract

The discovery of the Higgs boson suggests that also neutrinos get their mass from spontaneous symmetry breaking. In the simplest ungauged lepton number scheme, the Standard Model (SM) Higgs has now two other partners: a massive CP-even, as well as the massless Nambu-Goldstone boson, called majoron. For weak-scale breaking of lepton number the invisible decays of the CP- even Higgs bosons to the majoron lead to potentially copious sources of events with large missing energy. Using LHC results we study how the constraints on invisible decays of the Higgs boson restrict the relevant parameters, substantially extending those previously derived from LEP and shedding light on spontaneous lepton number violation.