CMS-PAS-B2G-20-002

CMS-PAS-B2G-20-002
Search for W' decaying to a vector-like quark and a top or bottom quark in the all-jets final state
CMS Collaboration
March 2021

Abstract: A search for a heavy W' boson resonance decaying to one B or T vector-like quark and a top or bottom quark, respectively, is presented. The analysis is performed using proton-proton collision data collected from the year 2016 to 2018 with the CMS detector at the LHC. The data correspond to an integrated luminosity of 137 fb$^{-1}$ at a center-of-mass energy of 13 TeV. Both decay channels result in a final state with a top quark, a Higgs or Z boson, and a b quark, each produced with significant energy. The all-hadronic decays of both the Higgs boson and the top quark are considered. The final-state jets, some of which correspond to merged decay products of a boosted top quark and a Higgs or Z boson, are selected using jet substructure techniques, which help to suppress standard model backgrounds. A W' boson signal would appear as a narrow peak in the invariant mass distribution of these three jets. No significant deviation in data with respect to the standard model background predictions is observed. The 95% confidence level upper limits on the cross section for W' boson production and the subsequent decay into a top quark, Higgs or Z boson, and b quark are set as a function of the W' boson mass, for several vector-like quark mass hypotheses. We exclude a W' boson in this channel with a mass below 3.2 TeV given benchmark model assumptions, and additionally present limits based on generalizations of these assumptions. This is the first search for a W' boson in this channel using the full 2016 to 2018 CMS data.
Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to JHEP. The superseded preliminary plots can be found here.

CMS Publications