MadEvent/MadGraph with the Four Generation Standardmodel

The tools presented on this page are based on work done of Tilman Plehn (Heidelberg), Graham Kribs (Oregon), Tim Tait (ANL & Northwestern) and Michael Spannowsky (Karlsruhe).

The main LHC-relevant ingredients of this software package are Madevent and Bridge. Both of these codes use a set of model files in the usual Madgraph/Madevent syntax, consistently including all relevant fourth-generation masses and couplings (without FCNC). The input format for the new model parameters is inspired by the SUSY Les-Houches accord and can be found in Madevent's param_card.dat. This file serves not only as the input to Madevent and Bridge, but also to codes which compute Higgs-physics effects (using a hacked version of Hdecay) and the contributions to S and T.

Results are presented in the original study.

intsllation:

• download

• tar xzvf madevent.tar.gz

• in madevent: type 'make' for the installation

• please note: this version of Madevent/MadGraph is not compatible with the gfortran compiler

using madevent:

• int the directory: 'madevent/Models/G4': change the model parameter in 'param_card.dat' like the mass of the 4th generation particles and install the new values of the parameters with 'make couplings'
• in the directory 'madevent/BRIDGE' : run with BRIDGE with './runBRI.exe' for the calculation of the Branching Fractions and the Width of the particles
• in the directory 'madevent' : create a workdirectory with a name of your choice and copy all files and directories to your workdirectory fro the 'Template' directory like 'cp -r Template workdir'
• in the directory 'madevent/workdir/Cards': change the file 'run_card.dat' for yor beam properties and the number of events and change the the file 'proc_card.dat' for the process which you are want to generate
• in the directory 'madevent/workdir/bin' : run './newprocess' for setup all the relevant file for the event generation and run './generate_events' for the event generation.
• in the directory 'madevent/workdir/Events' you will find the Les-Houches event files.