Disentangling soft and collinear effects in QCD parton showers

TL;DR

This paper presents a method to separate soft and collinear effects in QCD parton showers at a specific order, and analyzes the impact of triple-collinear corrections using the Dire shower implementation.

Contribution

It introduces a novel technique for disentangling soft and collinear logarithms in QCD evolution at (_s^2) and applies it to analyze triple-collinear corrections.

Findings

Triple-collinear corrections have a measurable impact on parton shower predictions.

The method improves understanding of soft and collinear effects in QCD simulations.

Implementation in the Dire shower demonstrates practical applicability.

Abstract

We introduce a method for the separation of soft and collinear logarithms in QCD parton evolution at $\mathcal{O}(\alpha_s^2)$ and at leading color. Using an implementation of the technique in the Dire parton shower, we analyze the numerical impact of genuine triple-collinear corrections from quark pair emission in $e^+e^-\to$ hadrons.