Speaker
Description
We investigate the sensitivity of future electron-proton colliders to anomalous $t \bar{t} \gamma$ interactions throught the photo-production process $\gamma p \to t \bar{t}$ where the photon is radiated from the incoming electron beam, and the neutral-current process $e^{-} p \to e^{-} t \bar{t}$ where the photon is exchanged between one of the top-quarks and the incident electron beam. We consider an electron beam of energy $60~\rm GeV$, and a proton beam of energy $7~\rm TeV$ and $50~\rm TeV$ to correspond to LHeC ($\sqrt{s} \approx 1.3~\rm TeV$) and the FCC-eh ($\sqrt{s} \approx 3.5~\rm TeV$), respectively. The study is carried out within the effective field theory framework, in which the $t \bar{t} \gamma$ interaction vertex is modified by CP-even and CP-odd operators corresponding to the anomalous magnetic and electric dipole moments of the top-quark. We analyze the effects of these couplings on the total production cross section and selected kinematic distributions, as well as the spin-correlation observables and asymmetries derived from the top-antitop decay products which can provide additional discriminating power and sensitivity to the underlying coupling structure.
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