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Search for same-sign top-quark production and fourth-generation down-type quarks in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

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Academic year: 2021

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Figure 1. Production of same-sign top-quark pairs via the production of a heavy vector boson (such as color-triplet Q 5 µ or color-sextet Y µ 5 [15]) in the s-channel (left) or exchange of a heavy vector boson (such as Z ′ or g ′ ) in the t-channel (right)
Table 1. Efficiencies of the event selection for heavy-quark and same-sign top-quark events in the heavy-quark signal region (two same-sign leptons, at least two jets, and E T miss > 40 GeV and H T > 350 GeV) as well as efficiencies of the event sele
Figure 3. Comparison of observed data and expected SM backgrounds in events with a pair of opposite-sign leptons, at least two reconstructed jets and missing transverse momentum greater than 40 GeV
Table 4. Predicted number of SM background events and observed data with two positively-charged leptons, at least two jets, E miss T > 40 GeV and H T > 350 GeV
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