# Event-Based Transverse Momentum Resummation

## TL;DR

This paper introduces an automated framework for precise transverse momentum resummation in electroweak processes, enabling detailed analysis of small transverse momentum observables with high accuracy.

## Contribution

It presents a fully differential, automated resummation method at NNLL accuracy matched to NLO fixed order, integrated into MadGraph5_aMC@NLO for electroweak final states.

## Key findings

- Successful implementation for Z and W boson production
- Good agreement with experimental data for transverse momentum distributions
- Enhanced analysis capabilities for small transverse momentum observables

## Abstract

We have developed a framework for automated transverse momentum resummation for arbitrary electroweak final states based on reweighting tree-level events. It is fully differential in the kinematics of the electroweak final states, which facilitates a straightforward analysis of arbitrary observables in the small transverse momentum region. We have implemented the resummation at next-to-next-to-leading logarithmic accuracy and match to next-to-leading fixed-order results using the event generator MadGraph5_aMC@NLO. Results for $Z$ and $W$ boson production with leptonic decay as well as $WZ$ production are presented. We compare to experimental measurements for the transverse momentum and the angular observable $\phi^*$.