LanHEP — A package for automatic generation of Feynman rules from the Lagrangian. Version 3.2

Abstract

We present a new version 3.2 of the LanHEP software package. New features of the program include tools for the models with extra dimensions, implementation of the particle classes for FeynArts output, using templates with LanHEP statements, color sextet particles and new substitution techniques which allow to define new routines. Program summaryProgram title: LanHEPCatalogue identifier: AECH_v2_0Program summary URL:http://cpc.cs.qub.ac.uk/summaries/AECH_v2_0.htmlProgram obtainable from: CPC Program Library, Queen’s University, Belfast, N. IrelandLicensing provisions: Standard CPC licence, http://cpc.cs.qub.ac.uk/licence/licence.htmlNo. of lines in distributed program, including test data, etc.: 92232No. of bytes in distributed program, including test data, etc.: 469861Distribution format: tar.gzProgramming language: C.Computer: PC.Operating system: Linux.RAM: 2MB (SM) - 12MB (MSSM) - 120MB (MSSM with counterterms)Classification: 4.4.Catalogue identifier of previous version: AECH_v1_0Journal reference of previous version: Comput. Phys. Comm. 180(2009)431Does the new version supersede the previous version?: YesNature of problem: Deriving Feynman rules from the LagrangianSolution method: The program 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. Tools for checking the correctness of the model, and for simplifying the output expressions are provided. The output is Feynman rules in terms of physical fields and independent parameters in the form of CompHEP or CalcHEP 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.Reasons for new version: New features make description of the new models simpler and allow to create models with extra dimensions and color sextets particles.Summary of revisions:•Tools for the models with extra dimensions.•The particle classes for FeynArts output.•Templates for the LanHEP statements.•Color sextet particles.•New substitution techniques which allow to define new routines.Running time: 1sec (SM) - 8sec (MSSM) - 8min (MSSM with counterterms)