Feasibility study of the forward-backward asymmetry of the e+e- -> t tbar process in all-hadronic decay modes at sqrt(s) = 500 GeV with the ILD detector

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We have studied the measurement accuracy of the forward-backward asymmetry of the e+e- → tt process in the 6-jet mode at √s = 500 GeV with the ILD detector. In the analysis the vertex charges of b-jets were used to distinguish t from t in each event. The distribution of the cosine of the reconstructed polar angle of so identified t or t showed a clear forward-backward asymmetry. After the correction for charge misidentification the forward-backward asymmetry was determined to be AᵗFB = 0.334 ± 0.0079 for 500 fb⁻¹ with the beam polarization combination of P(e+, e-) = (+30%, -80%), demonstrating a very good statistical accuracy (2%) even in the 6-jet mode.