We will be conducting essential system work on Wednesday 14th October 2026 between 5pm and 6pm UK time. This indico service will be unavailable during that time. We apologies for the inconvenience. Any queries to spcs-computing AT qmul.ac.uk.
Abstract:
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. We propose criteria for parton showers to be considered accurate at the next-to-leading logarithmic (NLL) level. We go on to introduce new classes of shower, for final-state radiation, satisfying the main elements of these criteria in the large-Nc limit. Finally, we compare results from concrete implementations of the new showers to those of observable-specific, analytical, NLL calculations.