ATLAS discovery potential for a heavy charged Higgs boson

TL;DR

This paper evaluates ATLAS detector's potential to discover heavy charged Higgs bosons across various models, focusing on promising decay channels and measurement precisions, with implications for supersymmetry, NMSSM, and extra-dimensional theories.

Contribution

It provides a detailed analysis of the ATLAS discovery potential for heavy charged Higgs bosons, including decay channels, parameter space coverage, and model-specific signals.

Findings

Coverage up to 600 GeV in mass for certain channels

Precise determination of Higgs mass and tanβ possible

Potential signals for models with singlet neutrinos in extra dimensions

Abstract

The sensitivity of the ATLAS detector to the discovery of a heavy charged Higgs boson is presented. Assuming a heavy SUSY spectrum, the most promising channels above the top quark mass are $H^\pm\to tb$ and $H^\pm\to\tau^\pm\nu_\tau$ which provide coverage in the low and high $\tan\beta$ regions up to $\sim 600$ GeV. The achievable precisions on the charged Higgs mass and $\tan\beta$ determination are also discussed. The $H^\pm\to W^\pm h^0$ channel, though restricted to a small MSSM parameter space, shows a viable signal in NMSSM where the parameter space is less constrained. The observation of the channel $H^-\to\tau^-_L\nu_\tau + c.c.$ may constitute a distinctive evidence for models with singlet neutrinos in large extra dimensions.