Top quark anomalous couplings at the International Linear Collider

We present a study of the experimental determination of the forward-backward asymmetry in the process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}t\overline{t}$ and in the subsequent $t\ensuremath{\rightarrow}Wb$ decay, studied in the context of the International Linear Collider. This process probes the elementary couplings of the top quark to the photon, and the $Z$ and the $W$ bosons at a level of precision that is difficult to achieve at hadron colliders. Measurement of the forward-backward asymmetry requires excellent $b$ quark identification and determination of the quark charge. The study reported here is performed in the most challenging all-hadronic channel ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}b\overline{b}q\overline{q}q\overline{q}$. It includes realistic details of the experimental environment, a full Monte Carlo simulation of the detector, based on the Silicon Detector concept, and realistic event reconstruction. The forward-backward asymmetries are determined to a precision of approximately 1% for each of the two choices of beam polarization. We analyze the implications for the determination of the $t\overline{t}Z$ and $Wt\overline{b}$ couplings.