Vector-like lepton searches at a muon collider in the context of the 4321 model* *Supported in part by the National Natural Science Foundation of China (12150005, 12075004, . 12061141002) and MOST (2018YFA0403900)

Abstract

A feasibility study is performed on the search for vector-like leptons (VLLs) at a muon collider in the context of the "4321 model", an ultraviolet-complete model with rich collider phenomenology and the potential to explain several recent existing B physics measurements or anomalies. Pair production and decays of VLLs lead to an interesting final state topology with multi-jets and multi-tau leptons. In this study, we perform a Monte Carlo investigation with various machine learning techniques and examine the projected sensitivity on VLLs over a wide mass range at a TeV-scale muon collider. We find that a 3 TeV muon collider with only of data can be sensitive over the mass range of a VLL up to 1450 GeV in the "4321 model."