Abstract: A search for the pair production of heavy vector-like partners T and B of the top and bottom quarks has been performed by the CMS experiment at the CERN LHC using proton?proton collisions at ?s = 13 TeV. The data sample was collected in 2016 and corresponds to an integrated luminosity of 35.9fb-1. Final states studied for TT¯ production include those where one of the T quarks decays via T?tZ and the other via T?bW, tZ, or tH, where H is a Higgs boson. For the BB¯ case, final states include those where one of the B quarks decays via B?bZ and the other B?tW, bZ, or bH. Events with two oppositely charged electrons or muons, consistent with coming from the decay of a Z boson, and jets are investigated. The number of observed events is consistent with standard model background estimations. Lower limits at 95% confidence level are placed on the masses of the T and B quarks for a range of branching fractions. Assuming 100% branching fractions for T?tZ, and B?bZ, T and B quark mass values below 1280 and 1130 GeV, respectively, are excluded.

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