CMS-PAS-B2G-20-014

CMS-PAS-B2G-20-014
A search for bottom-type, vector-like quark pair production in dileptonic and fully hadronic final states in proton-proton collisions at $ \sqrt{s} = $ 13 TeV
CMS Collaboration
21 August 2023

Abstract: A search is described for the production of a pair of bottom-type vector-like quarks (VLQs) with a mass greater than 1000 GeV. Each VLQ decays into a b quark and a Higgs boson, a b quark and a Z boson, or a t quark and a W boson. This analysis considers both fully hadronic final states and those containing a lepton pair from a Z boson decay. The products of the hadronic Higgs, Z, or W boson decays can be resolved as two distinct jets or merged into a single jet, so the final states are separated by the number of reconstructed jets. The analysis uses data corresponding to a total integrated luminosity of 138 fb$^{-1}$ collected in proton-proton collisions at $ \sqrt{s}= $ 13 TeV by the CMS detector at the LHC from 2016 to 2018. No signal in excess of the expected background is observed, and lower limits are set on the VLQ mass at 95% confidence level. These depend on the VLQ branching fractions and are 1570 GeV and 1540 GeV for 100% B $ \rightarrow $ bH and 100% B $ \rightarrow $ bZ, respectively. For many cases, they exceed by 100 GeV or more those of previous results.
Links: CDS record (PDF) ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to PRD. The superseded preliminary plots can be found here.

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