HOWTO force hdgeant4 to decay particles in certain channels
From GlueXWiki
1/ Prior to hdgeant4 step by running evtgen after generation as a postprocessor.
https://halldweb.jlab.org/wiki/index.php/HOWTO_Use_EvtGen_to_simulate_particle_decays_in_GlueX
2/ At hdgeant4 step by adding these lines to control.ini
Please look here: https://groups.google.com/g/gluex-software/c/n0NQMOX7bC4/m/IKUwwKDQAwAJ
TO-DO: summarize thread and show an example