We investigate the prospect of discovering the $SU(2)$ 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 ${\kappa }_B\in [0.19,0.32]([0.14,0.24])$. Finally, we also analyze the projected sensitivity in terms of the production cross section times branching fraction at the future 3 TeV CLIC.

我们调查发现 $\mathrm{小号}ü（\mathrm{2个}）$类单重态矢量底夸克（VLQ- B）${Ë}^{+}{Ë}^{-}$在3 TeV阶段在未来的紧凑型线性对撞机（CLIC）中发生碰撞。作为信号处理，我们专注于最终状态为4 b的VLQ- B的单次生产，即${Ë}^{+}{Ë}^{-}\to 乙\overline{b}\to Hb\overline{b}$ 其次是 $H\to b\overline{b}$。通过对信号和相关的SM背景进行全面的检测器仿真，可以得出耦合强度分别为2σ的排除极限和5σ的发现前景${\kappa }_{乙}$和综合的光度。对于b标记效率为70％（90％）的中等（松散）工作点，VLQ- B夸克可以排除在${\kappa }_{乙}\in [0.125，0.24][0.09，0.15]$ 和 ${米}_{乙}\in [1.3，2.0]$ TeV，而发现的区域可以达到 ${\kappa }_{乙}\in [0.19，0.32]（[0.14，0.24]）$。最后，我们还根据未来3 TeV CLIC的生产横截面乘以分支分数，分析了预计的灵敏度。