We study the logarithmic accuracy of angular-ordered parton showers by considering the singular limits of multiple emission matrix elements. This allows us to consider different choices for the evolution variable and propose a new choice which has both the correct logarithmic behaviour and improved performance away from the singular regions. In particular the description of e+e− event shapes in the non-logarithmic region is significantly improved.
@article{arxiv.1904.11866,
title = {Logarithmic Accuracy of Angular-Ordered Parton Showers},
author = {Gavin Bewick and Silvia Ferrario Ravasio and Peter Richardson and Michael H. Seymour},
journal= {arXiv preprint arXiv:1904.11866},
year = {2020}
}