# Herwig 7.1 Release Note

## TL;DR

Herwig 7.1 introduces significant improvements in multi-jet merging, soft interaction modeling, and hadronisation tuning, enhancing the accuracy and versatility of Monte Carlo event simulations in particle physics.

## Contribution

This release presents new features like multi-jet merging at LO and NLO, a soft interactions model, and improved top decay handling, advancing the capabilities of Herwig for collider simulations.

## Key findings

- Enhanced multi-jet merging with dipole shower at LO and NLO
- New soft interactions and diffraction model
- Updated hadronisation parameters and top decay improvements

## Abstract

A new release of the Monte Carlo event generator Herwig (version 7.1) is now available. This version introduces a number of improvements, notably: multi-jet merging with the dipole shower at LO and NLO QCD; a new model for soft interactions and diffraction; improvements to mass effects and top decays in the dipole shower, as well as a new tune of the hadronisation parameters.