Search for single production of vector-like B quark decaying to a Higgs boson and bottom quark at the CLIC

We investigate the prospect of discovering the $SU\left(2\right)$ singlet vector-like bottom quark (VLQ-B) in $e^{+}{e}^{-}$ collisions at future Compact Linear Collider (CLIC) at the 3 TeV stage. As signal process, we focus on single production of the VLQ-B with 4b final state, namely, $e^{+}{e}^{-}\to B\overline{b}\to hb\overline{b}$ followed by $h\to b\overline{b}$. By carrying out a full detector simulation for the signals and the relevant SM backgrounds, the 2σ exclusion limit and 5σ discovery prospects are, respectively, obtained on the coupling strength ${\kappa }_B$ and the integrated luminosity. For the medium (loose) working point with 70% (90%) b-tagging efficiency, the VLQ-B quark can be excluded in the region of ${\kappa }_B\in [0.125,0.24][0.09,0.15]$ and $m_B\in [1.3,2.0]$ TeV, while the discovered region can reach to ${\kappa }_B\in [0.19,0.32]\left(\right[0.14,0.24\left]\right)$. Finally, we also analyze the projected sensitivity in terms of the production cross section times branching fraction at the future 3 TeV CLIC.