Electroweak corrections to hadronic event shapes

TL;DR

This paper presents a detailed calculation of electroweak corrections to three-jet production and event-shape observables in electron-positron collisions, highlighting their significance at collider energies.

Contribution

It provides the first comprehensive calculation of electroweak O() corrections including photon isolation and cross section adjustments.

Findings

Corrections are at the few-percent level.

Remnants of radiative return to Z pole persist.

Corrections impact event-shape distributions at collider energies.

Abstract

We report on a recent calculation of the electroweak O(\alpha^3\alpha_s) corrections to 3-jet production and related event-shape observables at e+e- colliders. The calculation properly accounts for the experimental photon isolation criteria and for the corrections to the total hadronic cross section. Corrections to the normalised event-shape distributions, which are exemplarily discussed here for the thrust distribution at LEP and linear-collider energies, turn out to be at the few-per-cent level and show remnants of the radiative return to the Z pole even after inclusion of appropriate cuts.