Dilepton Signal of a Type-II Seesaw at CERN LHC: Reveals a TeV Scale B-L Symmetry

TL;DR

This paper investigates the potential to detect doubly charged Higgs bosons at the LHC within a B-L symmetric model, highlighting a distinctive like-sign dilepton signal at TeV scales.

Contribution

It introduces a B-L symmetric model with two triplet scalars enabling a TeV-scale type-II seesaw, predicting observable signals at the LHC.

Findings

Doubly charged Higgs bosons with masses 200-1000 GeV can be detected at 14 TeV LHC.

Like-sign dilepton signals are prominent for small triplet VEVs.

Detection is feasible with >30 fb^{-1} of data at 14 TeV.

Abstract

We explore the discovery potential of doubly charged Higgs bosons (\xi^{\pm\pm}) at the CERN Large Hadron Collider (LHC). For moderate values of the coupling constants in the original Type-II seesaw model, these doubly-charged Higgs bosons are not accessible by any present or near future collider experiments. In a gauged B-L symmetric model we introduce two triplet scalars to execute a variant of type-II seesaw at the TeV scale. This leads to a clear like-sign dilepton signal in the decay mode of \xi^{\pm\pm} for a small vacuum expectation value (\lsim 10^5 \eV) of the triplet scalar \xi= (\xi^{++}, \xi^+, \xi^0) of mass \lsim 1 \TeV. To be specific, for a mass range of 200-1000 GeV of \xi^{\pm\pm}, the like-sign dilepton signal can be detected at CERN LHC at a center of mass energy 14 TeV with an integrated luminosity > 30 {\rm fb}^{-1}. The same analysis is also pursued with center of mass energies 7 TeV and 10 TeV as well. We also comment on the decay mode of singly charged scalars and neutral B-L gauge boson in this model.