Searching for Heavy Charged Higgs Boson with Jet Substructure at the LHC

TL;DR

This paper proposes a novel jet substructure technique to detect heavy charged Higgs bosons at the LHC, demonstrating high sensitivity and background suppression for masses around 1 TeV.

Contribution

A hybrid-R reconstruction method utilizing top tagging and jet substructure techniques for improved heavy charged Higgs boson detection at the LHC.

Findings

Achieves 9.5σ significance for 1 TeV Higgs mass.

Reduces background events effectively.

Enhances reconstruction accuracy for heavy Higgs signals.

Abstract

We study the heavy charged Higgs boson (from 800 GeV to 1500 GeV in this study) in production associated with a top quark at the LHC with the collision energy $\sqrt{s}=14$ TeV. Such a heavy charged Higgs boson can dominantly decay into a top quark and a bottom quark due to its large Yukawa couplings, like in MSSM. To suppress background events and to confirm the signal, we reconstruct the mass bumps of the heavy charged Higgs boson and the associated top quark. For this purpose, we propose a hybrid-R reconstruction method which utilizes the top tagging technique, a jet substructure technique developed for highly boosted massive particles. By using the full hadronic mode of $p p \to H^{\pm} t \to t tb$ as a test field, we find that this method can greatly reduce the combinatorics in the full reconstruction and can successfully reduce background events down to a controlled level. The sensitivity of LHC to the heavy charged Higgs boson with two $b$ taggings is studied and a $9.5\sigma$ significance can be achieved when $m_{H^\pm} =1 \textrm{TeV}$.