missing MCParticle for particles scattered back into the calorimeter

[gaede]

If a particle is created outside of the tracking volume (e.g. the calorimeter) and scattered back into the tracking volume where it then creates SimTrackerHits:

• a new MCParticle should be created
  • ideally as daughter of the primary particle the went into the calorimeter
• SimTrackeHits should be assigned to this new MCParticle

Example in this picture:

Debug hints:

• should try and use the stored random seed for the event shown above and re-run ddsim with it