CompHEP is a software package for automatic computations in

high energy physics Particle physics or high-energy physics is the study of fundamental particles and forces that constitute matter and radiation. The field also studies combinations of elementary particles up to the scale of protons and neutrons, while the stu ...

from Lagrangians to collision events or particle decays. CompHEP is based on quantum theory of gauge fields, namely it uses the technique of squared

Feynman diagram In theoretical physics, a Feynman diagram is a pictorial representation of the mathematical expressions describing the behavior and interaction of subatomic particles. The scheme is named after American physicist Richard Feynman, who introduced ...

s at the tree-level approximation. By default, CompHEP includes the

Standard Model The Standard Model of particle physics is the Scientific theory, theory describing three of the four known fundamental forces (electromagnetism, electromagnetic, weak interaction, weak and strong interactions – excluding gravity) in the unive ...

Lagrangian in the unitarity and 't Hooft-Feynman gauges and several MSSM models. However users can create new physical models, based on different Lagrangians. There is a special tool for that - LanHEP. CompHEP is able to compute basically 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 In theoretical physics Theoretical physics is a branch of physics that employs mathematical models and abstractions of physical objects and systems to rationalize, explain, and predict List of natural phenomena, natural phenomena. This is in ...

and EW diagrams, masses of

fermions In particle physics, a fermion is a subatomic particle that follows Fermi–Dirac statistics. Fermions have a half-integer spin ( spin , spin , etc.) and obey the Pauli exclusion principle. These particles include all quarks and leptons and ...

and

bosons In particle physics, a boson ( ) is a subatomic particle whose spin quantum number has an integer value (0, 1, 2, ...). Bosons form one of the two fundamental classes of subatomic particle, the other being fermions, which have half odd-integer ...

and widths of unstable particles. Processes computed by means of CompHEP can be interfaced to the

Monte-Carlo Monte Carlo ( ; ; or colloquially ; , ; ) is an official administrative area of Monaco, specifically the ward of Monte Carlo/Spélugues, where the Monte Carlo Casino is located. Informally, the name also refers to a larger district, the Mon ...

generators

PYTHIA Pythia (; ) was the title of the high priestess of the Temple of Apollo (Delphi), Temple of Apollo at Delphi. She specifically served as its oracle and was known as the Oracle of Delphi. Her title was also historically glossed in English as th ...

and HERWIG as new external processes. The CompHEP project started in 1989 in Skobeltsyn Institute of Nuclear Physics (SINP) of

Moscow State University Moscow State University (MSU), officially M. V. Lomonosov Moscow State University,. is a public university, public research university in Moscow, Russia. The university includes 15 research institutes, 43 faculties, more than 300 departments, a ...

. During the 1990s this package was developed, and now it is a powerful tool for automatic computations of collision processes. The CompHEP program has been used in the past for many studies in many experimental groups as shown schematically in the scheme Due to an intuitive graphical interface CompHEP is a very useful tool for education in particle and nuclear physics.

External links

official CompHEP page

manual for version 3.3
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Skobeltsyn Institute of Nuclear Physics (SINP)
Monte Carlo particle physics software Physics software {{physics-software-stub