Precise predictions for an e+e−→ttˉ cross-section are presented in the energy region from 400 GeV to 800 GeV. Cross-sections are estimated including the beam-polarization effects with full O(α), and also with the effects of the initial-state photon emission. A radiator technique is used for the initial-state photon emission up to two-loop orders. In this investigation, a weak correction is defined as the full electroweak corrections without the initial-state photonic corrections. As a result, it is determined that the total cross-section of a top quark pair-production receives the weak corrections of +4% over the trivial initial state corrections at a center of mass energy of 500 GeV. Among the initial state contributions, a contribution from two-loop diagrams gives less than 0.11% correction over the one-loop ones at the center of mass energies of from 400 GeV to 800 GeV. In addition, the effect of a running coupling constant is also discussed.
@article{arxiv.1706.07042,
title = {ISR effects on loop corrections of a top pair-production at the ILC},
author = {Junpei Fujimot and Yoshimasa Kurihara and Nhi M. U. Quach},
journal= {arXiv preprint arXiv:1706.07042},
year = {2019}
}