LanHEP - a package for the automatic generation of Feynman rules in field theory. Version 3.0

TL;DR

LanHEP 3.0 automates the generation of Feynman rules from Lagrangians written in a compact, publication-friendly syntax, supporting supersymmetric theories and providing outputs compatible with various computational tools.

Contribution

It introduces a new version of LanHEP that simplifies the process of deriving Feynman rules from complex Lagrangians, including supersymmetric models, with versatile output formats.

Findings

Supports supersymmetric theories with superpotential formalism

Generates Feynman rules in multiple formats including CompHEP, FeynArts, and LaTeX

Enables calculation of one-loop counterterms in FeynArts format

Abstract

The LanHEP program version 3.0 for Feynman rules generation from the Lagrangian is described. It reads the Lagrangian written in a compact form, close to the one used in publications. It means that Lagrangian terms can be written with summation over indices of broken symmetries and using special symbols for complicated expressions, such as covariant derivative and strength tensor for gauge fields. Supersymmetric theories can be described using the superpotential formalism and the 2-component fermion notation. The output is Feynman rules in terms of physical fields and independent parameters in the form of CompHEP model files, which allows one to start calculations of processes in the new physical model. Alternatively, Feynman rules can be generated in FeynArts format or as LaTeX table. One-loop counterterms can be generated in FeynArts format.