Identify events directly from generator

[DavidDiezIb]

Events from generator appear in subEventPrimaryParticlename observable as empty category. Now they will be identified as coming from initial generator, so no secondary emission.

[lobis]

Events from generator appear in subEventPrimaryParticlename observable as empty category. Now they will be identified as coming from initial generator, so no secondary emission.

I'm not sure if I under understand @DavidDiezIb.

subEventPrimaryParticlename is the name of the sub-event primary particle. For example, if our primary is a neutron that produces some radioactive isotope that decays after a long time, this decay event will be split into a separate event, it's primary particle will still be the neutron and the subEventPrimaryParticlename will be the isotope.

If the event is not a sub-event, subEventPrimaryParticlename should be empty.

If you want to check if the event came straight from the generator, you can just check the sub-event id, if it's 0 it came from the generator. If you find this hard to remember you can create an auxilary method such as CreatedByGenerator which computes this.

[DavidDiezIb]

But the subEventPrimaryParticleName is just a variable created for this observable, isn't it?

What I want is that when I plot the observable, all events have a value. If they are not a sub event then just identify them as primary event, that's why I suggested "generator" which is quite generic. Or in that case do you need the observable empty?

[lobis]

But the subEventPrimaryParticleName is just a variable created for this observable, isn't it?

What I want is that when I plot the observable, all events have a value. If they are not a sub event then just identify them as primary event, that's why I suggested "generator" which is quite generic. Or in that case do you need the observable empty?

Yes if you want this information in the analysis tree it's true you need to add it as you did. It's already possible to check this by checking for an empty string but I guess writing "generator" is also fine.

Originally I was a bit hesitant because I thought this change was in the actual Geant4 Event itself.