First search for the process of interest in the Datacards directory. If the process you are looking for is not included there, look at the FPMC documentation or contact the developers.

To run FPMC, first:

mkdir build
cd build
cmake {PATH_TO_FPMC_SOURCES}
make

For example, for the process γγ → Spin 0 neutral resonance ϕ → γγ (with intact protons), use the command:

./fpmc-hepmc --cfg Datacards/dataQED_AAexoticSpin0EvenResonances --comenergy 13000 --nevents 1000

You can check some basic parameters of the collision and the coupling by editing the datacard, for example:

• the acceptance for the protons,
• the coupling value(s),
• the centre of mass energy,
• the output filename (default: tmpntuple.ntp)`
• etc.

You will find fpmc.hepmc file as an output.

Note:

• If you are working on the lxplus nodes, use source /cvmfs/sft.cern.ch/lcg/external/gcc/6.1.0/x86_64-slc6/setup.sh to set up the proper gcc environment.