Singlet vector-like T quark production in association with Wb at the CLIC

In a simplified model including an SU(2)singlet vector-like top quark T(VLT)with charge 2/3,we investigate the associated production of Wb with VLT at a Compact Linear Collider(CLIC).Focusing on the T→Wb decay channel,we discuss two decay models:e+e-→TW+b→(l-vb)(jjb)and e+e-→TW+b→(jjb)(l+νb).In this paper,we consider recent experimental limits including the electroweak precision observables,the width of the top quark,and the direct LHC searches.Through a detailed detector simulation,we show the exclusion and discovery capability on the T at 3 TeV CLIC,where the initial state radiation effect has also been considered.The results show that it is promising to detect the VLT at future high-energy e+e-colliders.

Search for the singlet vector-like top quark in the T→tZ channel with Z→vv at hadron colliders

Based on a simplified model including a singlet vector-like top quark T with charge|Q|=2/3,we analyze the prospects of observing T via the single T production in the tZ channel with Z decaying to neutrinos at the hadronhadron colliders.This simplified model only includes two free parameters,the coupling constant g^(*)and the T quark mass m_(T).To investigate the observability of the single T production,we perform a detailed background analysis and detector simulation for the collision energies 14 TeV,27 TeV,and 100 TeV.We scan the g^(*)-m_(T)parameter space and show the exclusion and discovery capabilities on the T quark with the highest integrated luminosity designed at these colliders.Moreover,the limits from the narrow-width approximation and electro weak precision observables are considered.