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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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.