Search for vector-like bottom with decay B → Zb considering large width effect at high energy e−γ collision

Abstract

We focus on the large width effect on the possibility of excluding or discovering the vector-like bottom quark that is singlet under SU(2) transform at the [Formula: see text] collisions. Focusing on the 3 TeV stage of the future Compact Linear Collider (CLIC), the process of single vector-like bottom quark production [Formula: see text] is investigated. Subsequently, the [Formula: see text] boson decays to one light-flavor lepton pair [Formula: see text], and the top quark decay to [Formula: see text] boson and bottom quark following with [Formula: see text] boson hadronic decay [Formula: see text]. By launching a comprehensive signal and background collider simulation, we obtain [Formula: see text] exclusion limit and [Formula: see text] discovering prospect based on coupling strength and mass of vector-like quark. We assume the integrated luminosity is 5 ab[Formula: see text]. Specially, we take the systemic uncertainty effect on the possibility of excluding or discovering the vector-like bottom quark into account. We find that the excluding irrelated region is [Formula: see text] and [Formula: see text] GeV, and the discovering irrelated region is [Formula: see text] and [Formula: see text] GeV in view of the systemic uncertainty [Formula: see text].