# Improved sensitivity on the electromagnetic dipole moments of the top quark in $\gamma\gamma$, $\gamma\gamma^*$ and $\gamma^*\gamma^*$ collisions at the CLIC

## TL;DR

This paper investigates the potential of the CLIC collider to improve measurements of the top quark's electromagnetic dipole moments through various photon-induced processes, achieving greater sensitivity than the LHC.

## Contribution

It provides a phenomenological analysis demonstrating enhanced sensitivity to top quark dipole moments at CLIC compared to previous collider experiments.

## Key findings

- CLIC can constrain top quark dipole moments to the order of 10^{-3} to 10^{-2}.
- Sensitivity at CLIC surpasses that of the LHC.
- Different collision processes at CLIC offer complementary sensitivity.

## Abstract

We realize a phenomenological study to examine the sensitivity on the magnetic moment and electric dipole moment of the top quark through the processes $\gamma\gamma\rightarrow t \bar{t}$, $e \gamma \rightarrow e \gamma^{*} \gamma \rightarrow e t \bar{t}$ and $e^{-} e^{+}\rightarrow e^{-} \gamma^{*} \gamma^{*} e^{+} \rightarrow e^{-} t \bar{t}e^{+}$ at the CLIC. We find that with a center-of-mass energy of the CLIC-1.4$\hspace{0.8mm}TeV$, integrated luminosity of ${\cal L}=1500\hspace{0.8mm}fb^{-1}$ and CLIC-3$\hspace{1mm}TeV$, integrated luminosity of ${\cal L}=2000\hspace{0.8mm}fb^{-1}$ with systematic uncertainties of $\delta_{sys}=0, 5, 10\hspace{1mm}\%$ at the $95\%\hspace{1mm}C. L.$, it is possible the CLIC may put limits on the electromagnetic dipole moments of the top quark $\hat a_V$ and $\hat a_A$ with a sensitivity of ${\cal O}(10^{-3}-10^{-2})$. Therefore, we show that the sensitivity with the CLIC data is much greater than that for the LHC data.