NNLO QCD corrections to event orientation in e+e- annihilation

TL;DR

This paper introduces a new NNLO QCD correction implementation for event orientation in electron-positron annihilation, enhancing accuracy and robustness of event-shape observable predictions at LEP and SLC.

Contribution

The work presents a novel NNLO QCD correction method for event orientation using antenna subtraction in the NNLOJET framework, including full initial state kinematics.

Findings

Event-orientation distributions are stable under higher order corrections.

The implementation improves the precision of event-shape observable calculations.

Results are consistent with experimental data from LEP and SLC.

Abstract

We present a new implementation of the NNLO QCD corrections to three-jet final states and related event-shape observables in electron--positron annihilation. Our implementation is based on the antenna subtraction method, and is performed in the NNLOJET framework. The calculation improves upon earlier results by taking into account the full kinematical information on the initial state momenta, thereby allowing the event orientation to be computed to NNLO accuracy. We find the event-orientation distributions at LEP and SLC to be very robust under higher order QCD corrections.