Resonance-aware subtraction in the dipole method

TL;DR

This paper introduces a resonance-aware subtraction method for NLO QCD calculations that maintains the virtuality of resonant propagators, improving the accuracy of top-quark related cross-section computations.

Contribution

It develops a novel resonance-aware subtraction technique based on pseudo-dipoles, enhancing the precision of NLO calculations involving resonant particles.

Findings

The new method effectively preserves resonance virtuality.

Application to WWbb and WWjj production demonstrates improved accuracy.

Comparison shows efficiency gains over standard dipole subtraction.

Abstract

We present a technique for infrared subtraction in next-to-leading order QCD calculations that preserves the virtuality of resonant propagators. The approach is based on the pseudo-dipole subtraction method proposed by Catani and Seymour in the context of identified particle production. As the first applications, we compute the ee > WWbb and pp > WWjbjb cross-section, which are both dominated by top-quark pair production above the threshold. We compare the efficiency of our approach with a calculation performed using the standard dipole subtraction technique.