CompHEP is a software package for automatic computations in High Energy Physics from Lagrangians to collision events or particle decays.
The CompHEP package consists of two parts, symbolic and numerical programs. The symbolic part is written in the C programming language. It produces C codes for squared matrix elements, and they are used in the numerical calculation later on.
CompHEP is based on quantum theory of gauge fields. CompHEP includes the Standard Model Lagrangian in the unitarity and ‘t Hooft-Feynman gauges and several MSSM models. Users can also create new physical models, based on different Lagrangians, using a dedicated toool (LanHEP).
CompHEP computes the LO cross sections and distributions with several particles in the final state (up to 6-7). It can take into account, if necessary, all QCD and EW diagrams, masses of fermions and bosons and widths of unstable particles. Processes computed by means of CompHEP can be interfaced to the Monte-Carlo generators PYTHIA and HERWIG as new external processes.
- Select a process by specifying incoming and outgoing particles.
- Generate Feynman diagrams, display them, and create the corresponding LATEX output.
- Exclude some diagrams.
- Generate and display squared Feynman diagrams.
- Calculate analytical expressions corresponding to squared diagrams by using the fast built-in symbolic calculator.
- Save symbolic results corresponding to the squared diagrams calculated in the Reduce and Mathematica codes for further symbolic manipulations.
- Generate the optimized C codes for the squared matrix elements for further numerical calculations.
- Launch the make program in order to prepare the numerical part.
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