Simulation of Finite Width Effects in Physics Beyond the Standard Model

TL;DR

This paper introduces a new method for accurately simulating finite width effects in BSM physics models, validated against standard matrix element calculations, and implemented in the Herwig++ event generator.

Contribution

A novel approach for including finite width effects in BSM physics simulations, integrated into Herwig++ for improved accuracy.

Findings

Method validated against Standard Model, MSSM, and MUED processes.

Implementation in Herwig++ enhances simulation capabilities.

Improves the realism of BSM physics event simulations.

Abstract

We present a method for the inclusion of finite width effects in the simulation of Beyond Standard Model (BSM) physics. In order to test the validity of the method we compare our results with matrix elements for a range of production and decay processes in the Standard Model, Minimal Supersymmetric Standard Model (MSSM) and Minimal Universal Extra Dimensions model (MUED). This procedure has been implemented in the Herwig++ event generator and will be available in a forthcoming release.