Pair production of the singlet vector-like B quark at the CLIC

Vector-like quarks (VLQs) are a common feature of many scenarios of new physics beyond the Standard Model (SM), which generally decay into a SM third-generation quark with a SM gauge boson or a Higgs boson. The presence of a new exotic decay mode of VLQs will reduce the branching ratios of these standard decay modes and thus relax the current mass exclusion limits from LHC experiments. Based on a model-independent framework, we investigate the prospect of discovering the pair production of the weak-singlet VLQ-B at the future 3-TeV Compact Linear Collider (CLIC), by focusing on the final states including one Z boson and four b-jets via two types of modes: Z → ${\ell }^{+}{\ell }^{-}$ and Z → $\nu \overline{\nu }$. By performing a rapid detector simulation of the signal and background events, and considering the initial state radiation and beamstrahlung effects, the exclusion limit at the 95% confidence level and the 5$\sigma$ discovery prospects are respectively obtained on the branching ratio of B → bZ and the VLQ-B masses at the future 3-TeV CLIC with an integrated luminosity of 5 ab${}^{-1}$.