== The Standard Model ==
=== Authors ===
   * Claude Duhr 
      * ETH, Zurich
      * duhrc@itp.phys.ethz.ch
   * Neil Christensen 
      * Michigan State University 
      * neil@pa.msu.edu 
   * Benjamin Fuks
      * IPHC Strasbourg / University of Strasbourg
      * benjamin.fuks@iphc.cnrs.fr
   * Celine Degrande
      * IPPP University of Durham
      * celine.degrande@durham.ac.uk

=== Model Files ===
   * [/attachment/wiki/StandardModel/SM.fr SM.fr] : This is the new main file (!FeynRules versions >= v1.6.2).  
   * [/attachment/wiki/StandardModel/SM_old.fr SM_old.fr] : This is the older implementation (!FeynRules versions < v1.6.2).  
=== Model Restrictions ===
   * [/attachment/wiki/StandardModel/Massless.rst Massless.rst]: Only the top, bottom and charm quarks, and the tau lepton are massive. 
   * [/attachment/wiki/StandardModel/DiagonalCKM.rst DiagonalCKM.rst]: The CKM maktrix is diagonal. 
   * [/feynrules/attachment/wiki/StandardModel/Cabibbo.rst Cabibbo.rst]: 3rd generation mixing is off. 
=== Instructions ===
The Standard Model (SM) is implemented in both Feynman and unitary gauge. A switch  {{{FeynmanGauge}}}  has been created. To switch between the two simply set {{{FeynmanGauge = True/False}}} inside your mathematica notebook after loading the model but before doing any calculations with it (finding vertices for example.) {{{FeynmanGauge}}} is set to {{{False}}} by default. The NLO counterterms have been computed and can be found in the 
[/attachment/wiki/StandardModel/SMQCD.nlo SMQCD.nlo]. They can be exported in the UFO format to Madgraph5/aMCatNLO.
=== Examples ===
   * [/attachment/wiki/StandardModel/SM.nb SM.nb]: This is an example Mathematica® notebook that loads SM.fr and calculates Feynman rules. 

=== Validation ===
The SM implementation was extensively tested on various 2-to-2 processes. A selection is shown in [/attachment/wiki/StandardModel/XS1.jpg this table]. (Note that the discrepancy with MG stock simply comes from the fact that MG stock has the 4 higgs vertex not implemented).
The counterterms analytic expressions have been checked with the literature and the UFO compared with the built in version of SM in Madgraph5/aMCatNLO.   

=== Interfaces ===

This model implementation is known to work with the following interfaces:
   * [wiki:FeynArtsInterface FeynArts Interface] 
   * [wiki:MadGraphInterface MadGraph Interface] 
   * [wiki:CalcHepInterface CalcHEP/CompHEP] 
   * [wiki:SherpaInterface Sherpa]