Probing the anomalous tqgamma couplings in photon-proton collisions

Abstract

The top quark flavor changing neutral current processes are extremely suppressed within the Standard Model. Nevertheless, they could be enhanced in a new physics model beyond the Standard Model. Investigating the top quark's flavor changing neutral current interactions at colliders would be an important test in terms of new physics. In this work, we examine the potentials of the processes $e^{-}p\to e^{-}{\gamma }^{\ast }p\to e^{-}{W}^{+}b{\gamma }^{\ast }\to e^{-}j\bar{j}b{\gamma }^{\ast }$ and $e^{-}p\to e^{-}{\gamma }^{\ast }p\to e^{-}{W}^{+}b{\gamma }^{\ast }\to e^{-}\text{l}{\nu }_{\text{l}}b{\gamma }^{\ast }$ at the FCC-eh with $\sqrt{s}=7.08$ and $10.0TeV$ to study anomalous $tq\gamma$ couplings via effective Lagrangians. We obtain $95\%$ confidence level sensitivities on the anomalous coupling parameters at the three FCC-eh energies and various integrated luminosities. We find that our limits are at least two orders of magnitude better than the current LHC experimental results.

Comments: 15 pages , 4 figures