Triple top signal as a probe of charged Higgs in a 2HDM

TL;DR

This paper investigates the potential of three top quark production as a signal for charged Higgs bosons in the 2HDM-II at the LHC, highlighting how this process can serve as a probe for new physics beyond the Standard Model.

Contribution

It provides a detailed simulation and analysis of three top production via charged Higgs decay in 2HDM-II, offering new exclusion bounds for charged and pseudoscalar Higgs masses at the 14TeV LHC.

Findings

Three top production cross section can be significantly enhanced in 2HDM-II.

The study establishes exclusion bounds on charged and pseudoscalar Higgs masses.

Final states with three or more leptons and same sign di-leptons are promising for detection.

Abstract

Within the framework of the type-II Two Higgs Doublet Model (2HDM-II) we study the production of three top quarks at the Large Hadron Collider (LHC). In the Standard Model the production cross section of three tops is low ($\approx 3$fb), while it is expected to be significant in the 2HDM-II for reasonable choices of the parameters. We study the production of a charged Higgs in association with a top quark, followed by the decays $H^{\pm} \to W^{\pm}A$ and $A \to t\bar{t}$. We undertake a full detector simulation of the signal, and use simple conservative cuts, focusing on the final states that contain three or more leptons, and exactly one same sign di-lepton pair. Finally, we present the exclusion bounds dependent on charged Higgs and pseudoscalar Higgs masses expected in the near future at the 14TeV LHC.