FeynRules - Feynman rules made easy

TL;DR

FeynRules is a Mathematica package that simplifies the process of implementing new particle physics models and generating Feynman rules, enabling seamless translation across multiple calculation programs.

Contribution

It introduces a versatile tool that automates deriving Feynman rules and translating models for various particle physics software, streamlining model implementation.

Findings

Supports multiple Feynman diagram calculation programs

Automates derivation of Feynman rules from models

Facilitates easy implementation of new particle physics models

Abstract

In this paper we present FeynRules, a new Mathematica package that facilitates the implementation of new particle physics models. After the user implements the basic model information (e.g. particle content, parameters and Lagrangian), FeynRules derives the Feynman rules and stores them in a generic form suitable for translation to any Feynman diagram calculation program. The model can then be translated to the format specific to a particular Feynman diagram calculator via FeynRules translation interfaces. Such interfaces have been written for CalcHEP/CompHEP, FeynArts/FormCalc, MadGraph/MadEvent and Sherpa, making it possible to write a new model once and have it work in all of these programs. In this paper, we describe how to implement a new model, generate the Feynman rules, use a generic translation interface, and write a new translation interface. We also discuss the details of the FeynRules code.