Abstract
A search for the pair production of heavy vector-like partners mathrm {T} and mathrm {B} of the top and bottom quarks has been performed by the CMS experiment at the CERN LHC using proton–proton collisions at sqrt{s} = 13,text {Te}text {V} . The data sample was collected in 2016 and corresponds to an integrated luminosity of 35.9,text {fb}^{-1}. Final states studied for mathrm {T} overline{mathrm {T}} production include those where one of the mathrm {T} quarks decays via mathrm {T} rightarrow mathrm {t}mathrm {Z} and the other via mathrm {T} rightarrow mathrm {b}mathrm {W}, mathrm {t}mathrm {Z}, or mathrm {t}mathrm {H} , where mathrm {H} is a Higgs boson. For the mathrm {B} overline{mathrm {B}} case, final states include those where one of the mathrm {B} quarks decays via mathrm {B} rightarrow mathrm {b}mathrm {Z} and the other mathrm {B} rightarrow mathrm {t}mathrm {W}, mathrm {b}mathrm {Z}, or mathrm {b}mathrm {H} . Events with two oppositely charged electrons or muons, consistent with coming from the decay of a mathrm {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 mathrm {T} and mathrm {B} quarks for a range of branching fractions. Assuming 100% branching fractions for mathrm {T} rightarrow mathrm {t}mathrm {Z}, and mathrm {B} rightarrow mathrm {b}mathrm {Z}, mathrm {T} and mathrm {B} quark mass values below 1280 and 1130,text {Ge}text {V}, respectively, are excluded.
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