Higgs effective Lagrangian

Author

Adam Alloul

• Groupe de Recherche en Physique des Hautes Energies - Universite de Haute Alsace
• adam.alloul@…

Benjamin Fuks

• CERN / Institut Pluridisciplinaire Hubert Curien / Universite de Strasbourg
• benjamin.fuks@…

Veronica Sanz

• University of Sussex
• v.sanz@…

Description of the model & references

The model we have implemented is based on the description given ​here and on the parametrization adopted ​here. The Lagrangian consists of an extension of the SM Lagrangian with terms of dimension up to six comprising

• the set of CP-conserving operators describing the strongly interacting Higgs Lagrangian declared as LSILH in the model file;
• the set of operators describing the interactions of a pair of Higgs fields with a pair of leptons or quarks declared as LF1 in the model file;
• the set of operators describing the interactions of a single Higgs field with a pair of leptons or quarks and a gauge boson declared as LF2 in the model file;
• the set of operators affecting the gauge sector and possibly modifying the gauge boson self-energies and self-interactions. The variable corresponding to this piece of the Lagrangian is LBosons;
• the set of CP-violating operators declared in the variable LCP.

Model file, Lagrangian and vertices

• Main FeynRules file for the full HEL model: HEL.fr.
• Example of a Mathematica® notebook loading the model and the parameters: HEL.nb.
• Full Lagrangian as calculated by FeynRules Lagrangian
• List of all vertices as calculated by FeynRules Vertices

Validation