Non-perturbative power corrections in event shapes

by Silvia Zanoli (University of Oxford)

Tuesday 16 Dec 2025, 11:30 → 12:30 Europe/Zurich

U2 - 5017 (University of Milano-Bicocca)

In recent years, perturbative calculations have reached unprecedented precision, driven by the growing need for accurate data-theory comparisons within the LHC physics program. However, as perturbative accuracy improves, one key challenge remains on the critical path to precision: hadronisation. Event shapes are an important class of observables that are strongly affected by hadronisation effects. The treatment of these effects is currently under active debate within the community, particularly in the context of strong coupling extractions.In this talk, I will discuss the anomalous scaling of linear power corrections in linear event shapes. The corresponding anomalous dimension has been calculated analytically to all orders, yielding a remarkably simple and universal result that holds even beyond the two-jet limit. Numerical checks have been performed within the PanScales framework, and comparisons with Pythia8 show very good agreement with the analytic predictions. This work paves the way toward a deeper understanding of the analytic structure of hadronisation.