== SM + Scalars ==
=== Author ===
   * Claude Duhr 
      * IPPP Durham 
      * claude.duhr@durham.ac.uk 

=== Description of the model ===

This model is an extension of the SM, where a new scalar sector is added. This new sector consists in an O(n) symmetric model that only interacts with itself and with the SM Higgs boson.

The implementation of the model is based on

" ''The minimal non-minimal Standard Model'' ", J.J. van der Bij, Phys.Lett.B636:56-59,2006, hep-ph/0603082.
=== Model files ===
   * [http://europa.fyma.ucl.ac.be/~duhr/twiki/pub/Main/StandardModelScalars/SMScalars.fr SMScalars.fr]: This is the main file. 
   * This model needs the model file of the [wiki:StandardModel SM implementation] of !FeynRules. 
=== Instructions ===

The model is loaded by merging the model files {{{SM.fr}}} and {{{SMScalars}}} (the two files must be stored in the same directory, see the [:UserManual:user manual]).

The implmentation allows for the use of the Feynman gauge in the SM.The switch between the two gauge is achieved via {{{FeynmanGauge = True/False}}} (see StandardModel).

The number of new scalars in the O(n) symmetric sector can be changed. This can be achieved by changing the variable {{{Nf}}} inside the model file '''before''' loading the model. The default value is {{{Nf = 4}}}.
=== Examples ===
   * [http://europa.fyma.ucl.ac.be/~duhr/twiki/pub/Main/StandardModelScalars/SMScalars.nb SMScalars.nb] : This is an example Mathematica® notebook that loads the model and calculates Feynman rules. 
   * [http://europa.fyma.ucl.ac.be/~duhr/twiki/pub/Main/StandardModelScalars/SMScalar.tex SMScalar.tex] : This is TeX output written by !FeynRules.