Search for pair production of vector-like quarks in the bWb‾W channel from proton–proton collisions at s=13TeV

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A search is presented for the production of vector-like quark pairs, T T ‾ or Y Y ‾ , with electric charge of 2/3 (T) or − 4 / 3 (Y), in proton–proton collisions at s = 13 TeV . The data were collected by the CMS experiment at the LHC in 2016 and correspond to an integrated luminosity of 35.8 fb − 1 . The T and Y quarks are assumed to decay exclusively to a W boson and a b quark. The search is based on events with a single isolated electron or muon, large missing transverse momentum, and at least four jets with large transverse momenta. In the search, a kinematic reconstruction of the final state observables is performed, which would permit a signal to be detected as a narrow mass peak (≈7% resolution). The observed number of events is consistent with the standard model prediction. Assuming strong pair production of the vector-like quarks and a 100% branching fraction to b W , a lower limit of 1295 GeV at 95% confidence level is set on the T and Y quark masses.