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| 3 | == The Higgs effective theory == |

| 4 | === Author === |

| 5 | * Claude Duhr |

| 6 | * Université catholique de Louvain |

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

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

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| 11 | This model describes the effective coupling of the Higgs boson to gluons and photons. The effective theory is obtained by integrating out the top-quark loop through which the higgs couples to gluons and photons. The corresponding effective theory for a pseudo-scalar is also included. |

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| 13 | The values of the effective couplings correspond to those given in the heft model of the !MadGraph/MadEvent distribution. |

| 14 | === References === |

| 15 | * " ''Gluon final states in higgs boson decay'' ", T.G. Rizzo, Phys. Rev., vol. D22, p. 178, 1980 |

| 16 | * " ''Production of a higgs pseudoscalar plus two jets in hadronic collisions'' ", R.P. Kauffman and S.V. Desai, Phys. Rev., vol. D59, p.057504, 1999 |

| 17 | * " ''Amplitudes for higgs bosons plus four partons'' ", R.P. Kauffman and S.V. Desai and D. Risal, 1999 |

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| 19 | === Model files === |

| 20 | * [http://europa.fyma.ucl.ac.be/~duhr/twiki/pub/Main/HiggsEffectiveTheory/HiggsEffective.fr HiggsEffective.fr] This is the main file. |

| 21 | * This model needs the model file of the [:StandardModel:SM implementation] of !FeynRules. |

| 22 | === <a name="Instructions"></a> Instructions === |

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| 24 | The model is loaded by merging the model files SM.fr and !HiggsEffective.fr (the two files must be stored in the same directory, see the [:UserManual:user manual]). |

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| 26 | The implementation allows for the use of the Feynman gauge in the SM. Feynman gauge is '''not''' supported for this model. |

| 27 | === <a name="Examples"></a> Examples === |

| 28 | * [http://europa.fyma.ucl.ac.be/~duhr/twiki/pub/Main/HiggsEffectiveTheory/HiggsEffective.nb HiggsEffective.nb] : This is an example Mathematica® notebook that loads the model and calculates Feynman rules. |

| 29 | * [http://europa.fyma.ucl.ac.be/~duhr/twiki/pub/Main/HiggsEffectiveTheory/HiggsEffective.tex HiggsEffective.tex] : This is !TeX output written by !FeynRules. |

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| 31 | -- Main.ClaudeDuhr - 05 Mar 2008 |

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