# HEJ 2: High Energy Resummation for Hadron Colliders

## TL;DR

HEJ 2 is a Monte Carlo event generator that implements high-energy resummation for hadron collider processes, significantly improving predictions by including all-order logarithmic corrections, especially for Higgs production with jets.

## Contribution

It introduces HEJ 2, a new flexible Monte Carlo tool that combines high-energy resummation with fixed-order calculations for better collider process predictions.

## Key findings

- Enhanced accuracy in Higgs plus jets predictions
- Effective inclusion of all-order logarithmic corrections
- Improved modeling of widely separated jet processes

## Abstract

We present HEJ 2, a new implementation of the High Energy Jets formalism for high-energy resummation in hadron-collider processes as a flexible Monte Carlo event generator. In combination with a conventional fixed-order event generator, HEJ 2 can be used to obtain greatly improved predictions for a number of phenomenologically important processes by adding all-order logarithmic corrections in $\hat{s}/p_\perp^2$. A prime example for such a process is the gluon-fusion production of a Higgs boson in association with widely separated jets, which constitutes the dominant background to Higgs boson production in weak-boson fusion.