== The !CalcHep/CompHEP interface ==
[http://www.ifh.de/~pukhov/calchep.html CalcHep] and [http://comphep.sinp.msu.ru/ CompHEP] are packages for calculation of Feynman diagrams, integration over multi-particle phase space and generating events.
=== Authors ===
* Neil Christensen
* Claude Duhr
=== Generating a !CalcHep/CompHEP model file with !FeynRules ===
Instructions for implementing a [http://theory.sinp.msu.ru/~pukhov/calchep.html CalcHep]/[http://comphep.sinp.msu.ru/ CompHEP] model in !FeynRules can be found in the manual which can be found at the [https://cp3.irmp.ucl.ac.be/projects/feynrules/wiki FeynRules website].
==== Limitations ====
Some limitations of [http://theory.sinp.msu.ru/~pukhov/calchep.html CalcHep]/[http://comphep.sinp.msu.ru/ CompHEP] are:
* Models with new color octets are generally a challenge to implement in [http://theory.sinp.msu.ru/~pukhov/calchep.html CalcHep]/[http://comphep.sinp.msu.ru/ CompHEP]. This is due to the fact that the color structure of vertices are left implicit. This is sufficient for the SM as well as many extensions, but not in all. Such a model may be implemented using auxilliary fields. If you are interested in such a model, please consider the following references:
* The [http://theory.sinp.msu.ru/~pukhov/calchep.html CalcHep]/[http://comphep.sinp.msu.ru/ CompHEP] user manual.
* [http://www.slac.stanford.edu/spires/find/hep/www?eprint=hep-ph/0502067 JHEP 0509:005,2005]
* [http://home.fnal.gov/~kckong/mued/ Minimal Universal Extra Dimensions] implementation in [http://theory.sinp.msu.ru/~pukhov/calchep.html CalcHep].
* others?
* Any limitation of [http://theory.sinp.msu.ru/~pukhov/calchep.html CalcHep]/[http://comphep.sinp.msu.ru/ CompHEP] is also a limitation of this interface.
==== Citation ====
Thank you for using our interface. If you publish any results using it, please cite:
* [http://www.slac.stanford.edu/spires/find/hep/www?eprint=arXiv:0906.2474 arXiv:0906.2474]