QCD Corrections to Four-jet Production and Three-jet Structure in e+ e- annihilation

TL;DR

This paper introduces MERCUTIO, a numerical program for calculating infrared safe four-jet quantities in electron-positron annihilation at next-to-leading order, improving efficiency and enabling new observable analysis.

Contribution

The paper presents MERCUTIO, a versatile NLO calculation tool based on dipole formalism with phase-space remapping, allowing detailed analysis of four-jet and three-jet event structures.

Findings

Validated four-jet fraction and D-parameter results against existing literature.

Provided new NLO results for jet broadening and softest-jet explanarity.

Demonstrated improved Monte Carlo integration efficiency.

Abstract

We report on the general purpose numerical program MERCUTIO, which can be used to calculate any infrared safe four-jet quantity in electron-positron annihilation at next-to-leading order. The program is based on the dipole formalism and uses a remapping of phase-space in order to improve the efficiency of the Monte Carlo integration. Numerical results are given for the four-jet fraction and the D-parameter. These results are compared with already existing ones in the literature and serve as a cross-check. The program can also be used to investigate the internal structure of three-jet events at NLO. We give results for previously uncalculated observables: the jet broadening variable and the softest-jet explanarity.