Studying the Infrared Behaviour of Improved Logarithmic Accuracy Parton Showers with Herwig

by Mike Seymour (The University of Manchester (GB))

Monday 27 Apr 2026, 14:00 → 15:00 Europe/Zurich

4/3-006 - TH Conference Room (CERN)

Recent progress in parton showers and resummation has led to the development of new showers with higher logarithmic accuracy. This study investigates these showers in an event generator environment, with particular focus on their interactions with non-perturbative physics. To this end, we complement the Catani-Seymour dipole shower framework in Herwig with the k_T-ordered PanGlobal and Forshaw-Holguin-Plätzer showers, and simulate all three with NLO matching and cluster hadronisation. We evaluate differences among them using cluster mass spectra and tune them to study their impact on the cluster hadronisation parameters. We observe that the new shower models provide improved infrared behaviour with respect to parton multiplicities and cluster mass spectra, which affects their sensitivity to the hadronisation parameters.

InfraredBehaviour.pdf

InfraredBehaviour.pptx