Non-resonant effects in the top-antitop resonance region

TL;DR

This paper reviews recent calculations of non-resonant corrections to top-antitop production near the resonance region, highlighting their significance for precise measurements at future colliders.

Contribution

It presents updated computations of non-resonant effects in top-antitop production, emphasizing their impact at NLO and relevance for high-precision top property determinations.

Findings

Non-resonant corrections start contributing at NLO.

Corrections reduce the cross section near the resonance peak.

Effects are comparable to future experimental precision.

Abstract

The recent developments on the computation of non-resonant corrections to the e+ e- -> W+ W- b bbar cross section in the top-antitop resonance region are reviewed in this talk. Non-resonant production of the final state W+ W- b bbar starts to contribute at NLO in the nonrelativistic power-counting v ~ alpha_s ~ sqrt(alpha_EW). The corrections induced by non-resonant effects reduce the cross section in the top-antitop resonance peak region at a level which is comparable to the expected experimental precision at the future linear collider, and are thus relevant for a high-precision top mass and width determination.