comphep:overview
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| CompHEP is a package for automatic calculations of elementary particle decays and collision processes in the lowest order of perturbation theory (the tree level approximation). The main idea behind the program is to make calculations and data manipulations from Lagrangians to final distributions with a high level of automation. There are several packages created to solve the problem in a similar way: FeynArts/ | CompHEP is a package for automatic calculations of elementary particle decays and collision processes in the lowest order of perturbation theory (the tree level approximation). The main idea behind the program is to make calculations and data manipulations from Lagrangians to final distributions with a high level of automation. There are several packages created to solve the problem in a similar way: FeynArts/ | ||
| + | This page describes CompHEP 4.6. | ||
| CompHEP is a GUI computer system with context help. A user makes all manupulations by means of graphical menus. | CompHEP is a GUI computer system with context help. A user makes all manupulations by means of graphical menus. | ||
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| * generate and display squared Feynman diagrams; | * generate and display squared Feynman diagrams; | ||
| * calculate analytical expressions corresponding to squared diagrams by using the fast built-in symbolic calculator; | * 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 | + | * save symbolic results corresponding to the squared diagrams calculated in the Reduce, Mathematica |
| * generate the optimized C codes for the squared matrix elements for further numerical calculations; | * 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; | * launch the make program in order to prepare the numerical part; | ||
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| The numerical part of CompHEP offers to: | 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; | + | * convolute the squared matrix element with structure functions and beam spectra: built-in CTEQ and LHAPDF |
| * modify physical parameters (total energy, charges, particle masses, charges, etc.) involved in the process; | * 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; | * select an evaluation scale for the QCD coupling constant and parton structure functions; | ||
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| * introduce a phase space mapping in order to smooth sharp peaks of squared matrix elements and structure functions; | * 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; | * perform Monte-Carlo phase space integration by Vegas; | ||
| - | * generate events; | + | |
| + | * scan cross sections and widths over model parameters; | ||
| + | * use complex form factors, particle widths as functions of model parameters, and diagrams multiplied by user-defined functions; | ||
| + | | ||
| * display distributions of various kinematic variables; | * display distributions of various kinematic variables; | ||
| - | * create graphical and LATEX outputs for the histograms. | + | * create graphical and LATEX outputs for the histograms; |
| + | * create one-, two- and three-dimensional plots in ROOT format, and build confidence regions in the model parameter space with a χ² analysis. | ||
| + | |||
| + | All models use PDG 2024 physical constants. Results are cross-validated against MadGraph5 and WHIZARD. | ||
| + | See the paper on [[https:// | ||
| ===== CompHEP Models. ===== | ===== CompHEP Models. ===== | ||
| - | The default set of models | + | A model is identified by its name, which is the first line of its files in the [[https:// |
| - | * QED | + | The current release includes these models: |
| - | * Effective 4 fermion (Fermi Model) | + | |
| - | * Standard Model in unitary gauge | + | |
| - | * Standard Model in Feynman gauge | + | |
| - | * MSSM in unitary gauge | + | |
| - | * MSSM in Feynman gauge | + | |
| - | * SUGRA in unitary gauge | + | |
| - | * GMSB in unitary gauge | + | |
| - | * Standard Model, with 2 quark generations unified (see more details in the [[http:// | + | |
| - | * QCD with 4 quarks unified (see more details in the [[http:// | + | |
| - | See [[http:// | + | * '' |
| + | * '' | ||
| + | * '' | ||
| + | * '' | ||
| + | * '' | ||
| + | * '' | ||
| + | * '' | ||
| + | * '' | ||
| + | * '' | ||
| + | * '' | ||
| + | * '' | ||
| + | * '' | ||
| + | * '' | ||
| + | * '' | ||
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| + | Models outside the distribution are collected in the [[: | ||
| + | |||
| + | See [[https://theory.sinp.msu.ru/ | ||
| ===== LanHEP overview ===== | ===== LanHEP overview ===== | ||
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| More details see [[http:// | More details see [[http:// | ||
| - | ===== CompHEP-Pythia interface | + | ===== Passing events to other generators |
| - | cpyth is a special package to process events prepared by CompHEP in PYTHIA. | + | CompHEP |
| - | The last version of the package is available | + | |
| ---- | ---- | ||
| - | //Copyright (C) 2003-2007 CompHEP Collaboration | Design by A.Kryukov// | + | //Copyright (C) 2003-2026 CompHEP Collaboration | Design by A.Kryukov// |
comphep/overview.1181063709.txt.gz · Last modified: by 127.0.0.1