FeynRules

Material

The latest version of FeynRules: ​download here.

The FeynRules (not up-to-date) manual: ​download here.

The slides associated to the lectures: ​download here.

Model files

During the lectures, a supersymmetric (SUSY) QCD theory is implemented.

• The gauge group is SU(3)_c (as in QCD)
• The field content is given by
  • Three generations of up-type quarks
  • Three generations of up-type left-handed squarks
  • Three generations of up-type right-handed squarks
  • A gluon
  • A gluino
• The free parameters of the theory consists in
  • The masses of the particles
  • The strong coupling constant (both gs and alpha_s)
• For the Lagrangian, see the slides.

The implementation has been performed in three different ways which will illustrate the different features of FeynRules.

• The good old way, using regular fields including a four-component representation for the fermions: susyqcd_dirac.fr
• A better approach, using regular fields including a two-component representation for the fermions: susyqcd_weyl.fr
• The best method for supersymmetric theoric, using superfields: susyqcd_sf.fr

In the case you want to start from your own Weyl fermion implementation to get the superfield implementation, you will have to replace right-handed Weyl quarks and right-handed squarks by their charge-conjugate counterparts. Since this will not be performed explicitly during the lectures, you can either do it yourself or download the add-on to merge to your model file here.

Tutorial

Documentation for projects 4 and 5:

• Paper on triple gauge boson interactions.
• Paper on the left-right symmetric Standard Model.