Electroweak and non-resonant corrections to top-pair production near threshold at NNLO

TL;DR

This paper calculates electroweak and non-resonant corrections at NNLO for top-pair production near threshold, improving the precision of top-quark mass measurements from electron-positron collision data.

Contribution

It provides the first complete NNLO calculation of electroweak and non-resonant effects for this process, refining theoretical predictions.

Findings

Electroweak and non-resonant corrections are significant at NNLO.

The corrections reduce the theoretical uncertainty in top-quark mass extraction.

Estimated theory uncertainty on the top-quark mass is improved.

Abstract

The top-quark mass can be determined with very high precision from a scan of the total $e^+e^-\to b\bar{b}W^+W^-X$ cross section near the top-pair production threshold. We present the full calculation of electroweak and non-resonant corrections to this process at NNLO. We discuss the size of the new contributions and estimate the theory uncertainty on the top-quark mass in the PS mass scheme.