Parton showers are among the most widely used tools in collider physics. Despite their key importance, none so far has been able to demonstrate accuracy beyond a basic level known as leading logarithmic (LL) order, with ensuing limitations across a broad spectrum of physics applications. In this letter, we propose criteria for showers to be considered next-to-leading logarithmic (NLL) accurate. We then introduce new classes of shower, for final-state radiation, that satisfy the main elements of these criteria in the widely used large-NC limit. As a proof of concept, we demonstrate these showers' agreement with all-order analytical NLL calculations for a range of observables, something never so far achieved for any parton shower.
@article{arxiv.2002.11114,
title = {Parton showers beyond leading logarithmic accuracy},
author = {Mrinal Dasgupta and Frédéric A. Dreyer and Keith Hamilton and Pier Francesco Monni and Gavin P. Salam and Gregory Soyez},
journal= {arXiv preprint arXiv:2002.11114},
year = {2020}
}
Comments
6 pages, 2 figures, plus supplemental material; v2 brings extra references and clarifications, as accepted by Physical Review Letters