Hadronic $b^{\prime }$ search at the LHC with top and W taggers

Abstract

We study the sensitivity of a down type quark $b^{\prime }$ via process $pp\to b^{\prime }\overline{b^{\prime }}\to t{W}^{-}\bar{t}{W}^{+}$ using jet substructure methods at the LHC with the collision energy $\sqrt{s}=14$ TeV. We consider the case that the $b^{\prime }$ is heavy (say from 800 GeV to 1500 GeV) and concentrate on the feasibility of the full hadronic mode. Both top tagger (the HEP top tagger) and W tagger (the CMS W-tagging) are used to reconstruct all objects in the final states. In order to suppress huge SM background events and take into account various cases with different number of boosted objects, we propose a comprehensive reconstruction procedure so as to extract the most crucial observables of the signal events. When $b^{\prime }$ mass is 1 TeV, it is found that with a 200 fb${}^{-1}$ dataset, the LHC may be able to detect the $b^{\prime }$ with a significance up to $10$ or better. With a 3000 $f{b}^{-1}$ dataset, the LHC may be able to probe the $b^{\prime }$ with a mass around up to 2 TeV, only by using the hadronic mode.

23 pages,8 figures, 4 tables. v2: discussions and references added, typos corrected, Accepted by JHEP

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