LHC ttγ and ttγγ data constrain electromagnetic and chromomagnetic dipole couplings of vector-like top quarks down to ~0.005 TeV^{-1} at 500 GeV mass, with weaker sensitivity at higher masses up to 2 TeV.
Antoniadis, Phys
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No significant excess observed in search for vector-like quark single production to Wb, setting 95% CL upper limits on κ_W as low as 0.086 near 1.4 TeV mass and excluding masses below 2.4 TeV at κ_W=0.2.
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Constraints on Vector-Like Top Dipole Interactions from Top-Associated Photon Measurements at the LHC
LHC ttγ and ttγγ data constrain electromagnetic and chromomagnetic dipole couplings of vector-like top quarks down to ~0.005 TeV^{-1} at 500 GeV mass, with weaker sensitivity at higher masses up to 2 TeV.
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Search for the single production of vector-like quarks decaying into a W boson and a b quark using single-lepton final states in proton-proton collisions at $\sqrt{s}$ = 13 TeV
No significant excess observed in search for vector-like quark single production to Wb, setting 95% CL upper limits on κ_W as low as 0.086 near 1.4 TeV mass and excluding masses below 2.4 TeV at κ_W=0.2.