NNLO predictions for event shapes and jet rates in electron-positron annihilation

TL;DR

This paper discusses the calculation of next-to-next-to-leading order (NNLO) predictions for event shapes and jet rates in electron-positron annihilation, which are crucial for precise determination of the strong coupling constant.

Contribution

It presents the first NNLO calculations for these observables, improving theoretical precision for extracting the strong coupling constant from experimental data.

Findings

NNLO predictions enhance the accuracy of jet rate calculations.

The results support more precise measurements of the strong coupling constant.

The work provides a foundation for future high-precision QCD analyses.

Abstract

The strong coupling constant is a fundamental parameter of nature. It can be extracted from experiments measuring three-jet events in electron-positron annihilation. For this extraction precise theoretical calculations for jet rates and event shapes are needed. In this talk I will discuss the NNLO calculation for these observables.