Probing a light sterile neutrino through heavy charged Higgs boson decays at the LHC

Yi-Lei Tang

doi:10.1103/physrevd.98.035043

Abstract

We show the 13 TeV proton-proton collider simulation in a $\nu$-two-Higgs-doublet-model ($\nu$-THDM). The heavy charged Higgs bosons are produced in pairs through the electroweak processes and decay to the light sterile neutrinos. The light sterile neutrino further decays into a jet-like object with a muon in it. This helps us discriminate the signal from the backgrounds with the standard model jets.

Highlights

The seesaw mechanisms [1,2,3,4,5] introduce some righthanded or sterile neutrinos with extremely heavy Majorana masses (∼109–1012 GeV) to create the light neutrino masses (≲0.1 eV according to the oscillation data)
If we reduce the masses down to about 1 TeV, the Yukawa coupling among the sterile neutrinos, left-handed neutrinos, and the Higgs doublet are predicted to be so small that it is nearly impossible to produce a practical signal at a collider
We have chosen the hadronic decay channel of the sterile neutrino because it has the largest branching ratio and it is more convenient for reconstructing the HÆ masses

Summary

INTRODUCTION

The seesaw mechanisms [1,2,3,4,5] introduce some righthanded or sterile neutrinos with extremely heavy Majorana masses (∼109–1012 GeV) to create the light neutrino masses (≲0.1 eV according to the oscillation data) This sort of model is far beyond the reach of a practical collider. We consider a situation where the charged Higgs boson mainly decays to a sterile neutrino plus a charged lepton This scenario can be found in some ν-twoHiggs-doublet models (ν-THDMs) [36,37,38,39]. We mainly consider hadronic decay and other new physics sectors that participate in the processes in this paper We apply this feature to efficiently eliminate the background

MODEL DESCRIPTION

SIMULATION DETAILS AND RESULTS

DISCUSSIONS

CONCLUSIONS