Detecting Heavy Charged Higgs Bosons at the LHC with Four b-Quark Tags

TL;DR

This paper explores the detection of heavy charged Higgs bosons at the LHC via a four b-quark tagging method, demonstrating potential for identifying signals within specific parameter ranges despite challenges in signal size.

Contribution

It introduces a novel approach using four b-tagging to identify heavy charged Higgs bosons in the MSSM at the LHC, emphasizing kinematic cuts and mass reconstruction techniques.

Findings

Effective separation of signal from background using kinematic cuts.

Signal detection feasible with high b-tagging efficiency (~50%).

Limited but promising parameter space for detection.

Abstract

We investigate the signature of a heavy charged Higgs boson of the Minimal Supersymmetric Standard Model in the lepton plus multi-jet channel at the Large Hadron Collider with four $b$-tags. The signal is the gluon-gluon fusion process $gg\to t\bar b H^-$, followed by the $H^-\to \bar t b$ decay, while the main background is from $gg\to t\bar t b\bar b$. We find that the two can be separated effectively by kinematic cuts and mass reconstruction, but the signal size is not very large in the end. Nonetheless, with a good $b$-tagging efficiency, $\epsilon_b\sim50%$, this channel can provide a viable signature over a limited but interesting range of the parameter space.