== Compact HEIDI ==

=== Implementation Author ===

   * Christian Speckner
   * Freiburg University
   * Christian.Speckner _AT_ physik.uni-freiburg.de

This implementation is a descendant of [wiki:StandardModelScalars SM + Scalars].

=== References ===

   * "Exploring the golden channel for HEIDI models using an interface between WHIZARD and !FeynRules", N. D. Christensen, C. Duhr, B. Fuks, J. Reuter, C. Speckner, [http://arxiv.org/abs/1010.3251 arXiv:1010.3251]
   * "The Minimal non-minimal standard model.", J. van der Bij, Phys.Lett.B636:56-59,2006. 

=== Model files ===

   * [attachment:HEIDI.fr]: FeynRules model file, requires [http://feynrules.phys.ucl.ac.be/attachment/wiki/CHEIDI/Heidi.m Heidi.m] and [http://feynrules.phys.ucl.ac.be/attachment/wiki/CHEIDI/Hdecay.m Hdecay.m] to function.
   * [http://feynrules.phys.ucl.ac.be/attachment/wiki/CHEIDI/Heidi.m Heidi.m]: Standalone spectrum generator, requires [http://feynrules.phys.ucl.ac.be/attachment/wiki/CHEIDI/Hdecay.m Hdecay.m] to function.
   * [http://feynrules.phys.ucl.ac.be/attachment/wiki/CHEIDI/Hdecay.m Hdecay.m]: Parameterized [http://arxiv.org/abs/hep-ph/9704448 HDECAY] output.
   * [http://feynrules.phys.ucl.ac.be/attachment/wiki/CHEIDI/HEIDI_bundle.fr HEIDI_bundle.fr]: Standalone bundle.

=== Instructions ===

The model can be used either via the standalone bundle {{{HEIDI_bundle.fr}}} or via the 'pure' model file {{{HEIDI.fr}}}. Please note that the latter does not include {{{Heidi.m}}} and {{{Hdecay.m}}} which therefore have to be downloaded (see above) and put into the mathematica search path separately. The model is intended to be used on top of {{{SM.fr}}}, e.g. via {{{LoadModel["SM/SM.fr", "HEIDI.fr"]}}}. Prior to loading, several flags have to be set which determine the scalar spectrum, please take a look at [http://arxiv.org/abs/1010.3251	arXiv:1010.3251] for further details.

=== Notes ===

At the moment, the model only supports unitarity gauge. In addition, the effective gluon fusion couplings are not compatible with the [wiki:MadGraphInterface MadGraph] interface at the moment. Both restrictions will be removed in a future revision.