Isolating New Physics signatures of vectorlike quarks and heavy Higgses over multi $b$-jet backgrounds

TL;DR

This paper explores how models with vectorlike quarks and a second Higgs doublet produce distinctive multi-$b$-jet signals at colliders, highlighting experimental challenges and sensitivities for ATLAS and CMS searches.

Contribution

It provides a detailed analysis of collider signatures involving heavy Higgses and vectorlike quarks, emphasizing cascade decays and their experimental detectability.

Findings

Cascade decays dominate branching ratios in these models.

Multi-$b$-jet signals pose significant experimental challenges.

Sensitivity estimates for ATLAS and CMS are provided.

Abstract

We discuss models in which vectorlike quarks and a second Higgs doublet are simultaneously present and couple to the third generation of SM quarks. A general feature of these models is that cascade decays of vectorlike fermions into heavy Higgses (or vice versa, depending on their masses) dominate their respective branching ratios. The resulting collider signals involve a large multiplicity of $b$-jets and offer formidable experimental challenges. We present a detailed and realistic analysis of the expected sensitivity of dedicated searches at ATLAS and CMS.