Probing the anomalous tqgamma couplings in photon-proton collisions

TL;DR

This paper investigates the potential to detect anomalous tqγ couplings via top quark flavor changing neutral currents at the FCC-eh collider, providing sensitivity estimates that surpass current LHC limits.

Contribution

It introduces a new analysis of top quark FCNC interactions at FCC-eh, offering improved sensitivity bounds on anomalous couplings using photon-proton collision processes.

Findings

Sensitivity limits are at least two orders of magnitude better than current LHC results.

Analyzes processes involving top quark production at FCC-eh energies of 7.08 and 10.0 TeV.

Provides 95% confidence level bounds on anomalous tqγ couplings.

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} {\rightarrow} {e^{-}} {\gamma}^{*} {p} {\rightarrow} {e^{-}} W^{+} b {\gamma}^{*}{\rightarrow} {e^{-}} {j} {\bar{j}} b {\gamma}^{*} $ and ${e^{-}} {p} {\rightarrow} {e^{-}} {\gamma}^{*} {p} {\rightarrow} {e^{-}} W^{+} b {\gamma}^{*}{\rightarrow} {e^{-}} \textit{l} {\nu}_\textit{l} b {\gamma}^{*} $ at the FCC-eh with $\sqrt{s} = 7.08 $ and $ 10.0 TeV $ 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.