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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.

 CompHEP 4.5.2

Free to download


Non-profit Use License

CompHEP team


System Requirements

User Manual, FAQ, Mailing List, Particle Physics Tour, LanHEP

Selected Reviews:
Physical results by means of CompHEP

Features include:

  • 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

The numerical part of CompHEP offers to:

  • Convolute the squared matrix element with structure functions and beam spectra: built-in CTEQ and LHAPDF parton distribution functions, the ISR and Beamstrahlung spectra of electrons, the laser photon spectrum, and the Weizsaecker-Williams photon structure functions are available
  • Modify physical parameters (total energy, charges, particle masses, charges, etc.) involved in the process
  • Select an evaluation scale for the QCD coupling constant and parton structure functions
  • Introduce various kinematic cuts. Some cuts are built in and there is a special code to define more involved cuts
  • Define a kinematic scheme (a phase space parameterization) for effective Monte Carlo integration
  • Introduce a phase space mapping in order to smooth sharp peaks of squared matrix elements and structure functions
  • Perform Monte-Carlo phase space integration by Vegas
  • Generate events
  • Display distributions of various kinematic variables
  • Create graphical and LATEX outputs for the histograms

CompHEP in action

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Last Updated Tuesday, October 14 2014 @ 02:22 PM EDT

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