Parton showers with more exact color evolution

TL;DR

This paper introduces a new scheme for QCD color evolution in parton shower generators that allows systematic improvement of accuracy, balancing precision and computational resources.

Contribution

A novel color evolution scheme for parton showers that enables systematic accuracy improvements beyond existing approximations.

Findings

The new scheme improves color evolution accuracy over previous methods.

It allows adjustable precision based on available computational resources.

Potential for more precise simulations in particle physics.

Abstract

Parton shower event generators typically approximate evolution of QCD color so that only contributions that are leading in the limit of an infinite number of colors are retained. Our parton shower generator, Deductor, has used an "LC+" approximation that is better, but still quite limited. In this paper, we introduce a new scheme for color in which the approximations can be systematically improved. That is, one can choose the theoretical accuracy level, but the accuracy level that is practical is limited by the computer resources available.