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Vector-like quarks are introduced in various new physics models beyond thestandard model (SM) at the TeV scale. We especially consider the case that thequark is singlet (triplet) under the SU(2)$_L$ (SU(3)$_c$) gauge group andcouples only to the third generation quarks of the SM. The vector-like quark ofthis kind is often called a top partner. The top partoner $t_p$ decays into$bW, tZ$ and $th$. In the ATLAS and CMS collaborations, the top partner hasbeen searched in the final states of $bW$ and $tZ$, while the search based onthe decay mode $t_p\to th$ has not been started yet. However, the decay into$th$ is important since it is significantly enhanced if some strong dynamicsexists in the TeV scale. In the presence of a light higgs boson, the decay mode$t_p\to th$ followed by $h\to b\bar{b}$ produces three bottom quarks. We studythe sensitivity for the top partner using multi-b-jet events at the 8 TeV runof the LHC experiment. The multi-b-jet eventss turn out to play a complementaryrole to the existing $t_p\rightarrow bW$ and $tZ$ searches by the ATLAS and CMScollaborations.

Search for the Top Partner at the LHC using Multi-b-Jet Channels