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| 3 | == SM + Scalars == |

| 4 | === Author === |

| 5 | * Claude Duhr |

| 6 | * Universite catholique de Louvain |

| 7 | * claude.duhr@uclouvain.be |

| 8 | |

| 9 | === Description of the model === |

| 10 | |

| 11 | 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. |

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| 13 | The implementation of the model is based on |

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| 15 | " ''The minimal non-minimal Standard Model'' ", J.J. van der Bij, Phys.Lett.B636:56-59,2006, hep-ph/0603082. |

| 16 | === Model files === |

| 17 | * [http://europa.fyma.ucl.ac.be/~duhr/twiki/pub/Main/StandardModelScalars/SMScalars.fr SMScalars.fr]: This is the main file. |

| 18 | * This model needs the model file of the [:StandardModel:SM implementation] of !FeynRules. |

| 19 | === Instructions === |

| 20 | |

| 21 | 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]). |

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| 23 | 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). |

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| 25 | 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=. |

| 26 | === Examples === |

| 27 | * [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. |

| 28 | * [http://europa.fyma.ucl.ac.be/~duhr/twiki/pub/Main/StandardModelScalars/SMScalar.tex SMScalar.tex] : This is !TeX output written by !FeynRules<a rel="nofollow" href="http://europa.fyma.ucl.ac.be/%7Eduhr/twiki/bin/edit/Trash/MainFeynRules?topicparent=Main.StandardModel" title="Create this topic">?</a>. |

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| 30 | -- Main.ClaudeDuhr - 05 Mar 2008 |

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