Exploring vector-like $B$-quark pair production at CLIC in fully hadronic final states

Abstract

We investigate the discovery potential of the $3\mathrm{TeV}$ Compact Linear Collider (CLIC) for a singlet vector-like bottom partner $B$ decaying via $B\to tW$. Focusing on the fully hadronic final state $B\bar{B}\to tWtW$, we reconstruct boosted top and $W$ candidates using large-$R$ Valencia jets, supplemented by a merging strategy for partially resolved decays. A systematic scan of the jet-radius parameter identifies $R=0.8$ as the optimal choice, balancing boosted-jet containment with jet multiplicity. Using a cut-based analysis optimized for the $(2t+2W)$ topology and an integrated luminosity of $5{\mathrm{ab}}^{-1}$, CLIC can achieve sensitivity to $m_B\lesssim 1.5\mathrm{TeV}$. These results highlight CLIC's excellent capability to probe heavy vector-like quarks in high jet multiplicity environments, extending well beyond the reach of current hadron collider searches.

Comments: 14 pages, 3 figures, and 2 tables. Update to the published version