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

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 $e^{+}{e}^{-}\to e^{-}{\gamma }^{\ast }{e}^{+}\to \bar{t}b{\nu }_e{e}^{+}$ (${\gamma }^{\ast }$ is the Weizsacker-Williams photon) which are one of the most important sources of single top quark production. For the systematic uncertainties of ${\delta }_{sys}=0\%,5\%$, $b-\text{mbox}taggingefficiency=0.8$, center-of-mass energy of $\sqrt{s}=3TeV$, integrated luminosity of $\mathcal{L}=2a{b}^{-1}$ and $2\sigma (3\sigma )$ 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 $\mathcal{O}(10^{-2}-10^{-1})$, which are highly competitive with those recently reported in previous studies.

Comments: 26 pages, 6 figures. arXiv admin note: text overlap with arXiv:1412.2094