= Type III Seesaw =

== Authors ==

* Carla Biggio
   * Institut de Fisica d'Altes Energies (IFAE), Universitat Autonoma de Barcelona (UAB), Spain
   * email: biggio _at_ ifae.es
* Florian Bonnet
   * INFN-Padova
   * email: florian.bonnet _at_ pd.infn.it

== Model Description ==
This model describes the minimal realisation of the Type III Seesaw. It is an extension of the SM where a fermionic triplet is add to the matter content. The fermionic triplet is introduced into the form of a heavy Dirac charged lepton tr^+/-^ and a heavy Majorana neutral lepton tr^0^.  


== References ==
* "mu->e gamma and tau->l gamma decays in the fermion triplet seesaw", A. Abada, C. Biggio, F. Bonnet, B. Gavela, T. Hambye, Phys. Rev. D78 (2008) 033007.
* "Implementation of the Type III Seesaw model in FeynRules/MadGraph and prospect for discovery with LHC data", C. Biggio, F. Bonnet, xxxxx

== Model Files ==

* [http://feynrules.phys.ucl.ac.be/wiki/TypeIIISeeSaw/typeIIIseesaw1.0.fr typeIIIseesaw1.0.fr]: this is the file containing the model

* For MadGraph/MadEvent and BRIDGE users: [http://feynrules.phys.ucl.ac.be/attachment/wiki/TypeIIISeeSaw/formats.inc formats.inc]: this is a modified version of the file formats.inc, that can be useful when dealing with small mixing angles (the original file sets to zero couplings smaller than 10^-5^)

* [http://feynrules.phys.ucl.ac.be/wiki/TypeIIISeeSaw/typeIIIseesaw.nb  typeIIIseesaw.nb]: this is a Mathematica notebook that loads the model and export it to the `MadGraph` and `CalcHep` format.

== Validation ==

== Notes ==

We implemented the couplings to Goldstone bosons so the implmentation allows for the use of Feynman gauge. We have checked that the exportation to the `CalcHep` format is successfull however we did not check the `CalcHep` output.