Constraining MPI models using sigma_effective and recent Tevatron and LHC Underlying Event data

TL;DR

This paper reviews Herwig++'s multi-parton interaction models, demonstrating their consistency with recent Tevatron and LHC data, and providing stable predictions for underlying event observables at 14 TeV.

Contribution

It presents a comprehensive analysis of Herwig++'s MPI model, showing its compatibility with experimental measurements of sigma_effective and underlying event data.

Findings

Herwig++ model aligns with sigma_effective measurements.

Model provides stable predictions at 14 TeV.

Compatibility with Tevatron and LHC data confirmed.

Abstract

We review the modelling of multiple interactions in the event generator Herwig++ and study implications of recent tuning efforts to Tevatron and LHC data. It is often said that measurements of the effective cross section for double-parton scattering, sigma_effective, are in contradiction with models of the final state of multi-parton interactions, but we show that the Herwig++ model is consistent with both and gives stable predictions for underlying event observables at 14 TeV.