A search for the first generation charged vector-like leptons at future colliders

TL;DR

This paper explores the potential to discover first-generation charged vector-like leptons at future colliders, proposing search strategies and estimating mass reach limits for HE-LHC and FCC.

Contribution

It highlights the importance of including vector-like leptons in future collider searches and provides mass reach estimates for their detection at upcoming facilities.

Findings

HE-LHC can probe charged leptons up to 0.9 TeV (iso-singlet) and 1.5 TeV (iso-doublet)

FCC can extend the search up to 2 TeV (iso-singlet) and 3.6 TeV (iso-doublet)

Pair production with specific decay channels offers promising detection prospects.

Abstract

Flavor Democracy Hypothesis favors existence of iso-singlet quarks and vector-like charged leptons. Their observation at future colliders could shed light on the nature of mass and mixing patterns of known leptons and quarks, as well as Higgs boson itself. Vector-like quarks are extensively searched by ATLAS and CMS collaborations. Unfortunately, this is not the case for vector-like leptons, while they have actually similar status from phenomenology viewpoint. We argue that vector-like charged leptons should be included into the new physics search programs of future energy frontier colliders. It is shown that pair production at the HE-LHC with decay of one of the leptons to Ze and another to He channel, followed by H \rightarrow bb and Z \rightarrow \mu\mu decays will give opportunity to scan masses of iso-singlet and iso-doublet charged leptons up to 0.9 TeV and 1.5 TeV, respectively. FCC will extend this region up to 2 TeV for iso-singlet and 3.6 TeV for iso-doublet charged leptons.