Speaker
Description
Non-perturbative effects present an important contribution to precise measurements of SM parameters. They are typically studied using Monte Carlo event generators that complement fixed-order predictions with non-perturbative models. These models are of empirical nature and need to be tuned to experimental measurements in order to provide accurate predictions. Once tuned, they are typically considered universal, being approximately accurate for all particle final states.
However, we observe that the non-perturbative modelling behaves differently for dijet and Drell-Yan plus jet processes. While separate hadronization effects show no unexpected behaviour and although perturbative effects play a role in the latter, further studies indicate that the observed nonconformities originate in the modelling of the underlying event. However, no measurement exists up to date that would be directly sensitive to these differences, so it remains to future measurements to ultimately confirm or rule out these features.
