Bounds on the electromagnetic dipole moments through the single top production at the CLIC

TL;DR

This paper estimates future bounds on the top quark's electromagnetic dipole moments at the CLIC collider, demonstrating potential improvements over current limits through analysis of specific single top production processes.

Contribution

It provides new projected bounds on top quark dipole moments using future collider scenarios and considers both unpolarized and polarized beams with systematic uncertainties.

Findings

Future collider bounds on dipole moments are of order 10^{-2} to 10^{-1}.

Single top production processes are effective for probing top quark electromagnetic properties.

Results are highly competitive with recent experimental constraints.

Abstract

We obtain bounds on the anomalous magnetic and electric dipole moments of the $t$-quark from a future high-energy and high-luminosity linear electron positron collider, such as the CLIC, with unpolarized and polarized electron beams which are a powerful tool to determine new physics. We consider the processes $\gamma e^- \to \bar t b\nu_e$ ($\gamma$ is the Compton backscattering photon) and $e^+e^- \to e^-\gamma^* e^+ \to \bar t b\nu_e e^+$ ($\gamma^*$ is the Weizsacker-Williams photon) which are one of the most important sources of single top quark production. For the systematic uncertainties of $\delta_{sys}=0\%,\hspace{1mm}5\%$, $b-\mbox{tagging efficiency}=0.8$, center-of-mass energy of $\sqrt{s}=3\hspace{0.8mm}TeV$, integrated luminosity of ${\cal L}=2\hspace{0.5mm}ab^{-1}$ and $2\sigma\hspace{1mm}(3\sigma)$ C.L. the future $e^+e^-$ collider may put bounds on the electromagnetic dipole moments $\hat a_V$ and $\hat a_A$ of the top quark of the order of ${\cal O}(10^{-2}-10^{-1})$, which are highly competitive with those recently reported in previous studies.