Precise predictions for an e+e−→ttˉ cross section are presented at an energy region from 400 GeV to 800 GeV. Cross sections are estimated including the beam-polarization effects with full O(α), and also with effects of the initial-state photon emission. A radiator technique is used for the initial-state photon emission up to two-loop order. A weak correction is defined as the full electroweak corrections without the initial-state photonic corrections. As a result, it is obtained 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 centre 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, an effect of a running coupling constant is also discussed.
@article{arxiv.1802.07826,
title = {$\mathcal{O}(\alpha^2)$ ISR effects with a full electroweak one-loop correction for a top pair-production at the ILC},
author = {Junpei Fujimoto and Yoshimasa Kurihara and Nhi M. U. Quach},
journal= {arXiv preprint arXiv:1802.07826},
year = {2019}
}
Comments
Comments: 12 pages, 5 figures. Prepared for JHEP. Portions of this work previously appeared as arXiv:1706.07042, on which this heavily draws