Improving the description of multiple interactions in Herwig

TL;DR

This paper discusses recent updates to the modeling of multiple parton interactions in the Herwig 7 Monte Carlo generator, aiming to improve the description of complex collision events.

Contribution

It introduces new modifications to the Herwig 7 framework for multiparton interactions, enhancing the accuracy of event simulations.

Findings

Improved modeling of multiple interactions in Herwig 7.

Better agreement with experimental data on minimum bias events.

Enhanced theoretical consistency of the MPI implementation.

Abstract

The modelling of multiple parton interactions in Monte Carlo event generators is a crucial part not only for the dressing of signal processes but also to describe data with a minimum bias on the event selection. Much work has and will be put into the theoretical framework and the numerical implementation of these models. In this contribution, we summarize various changes to the machinery of multiparton interactions and related physics in the Monte Carlo event generator Herwig 7.