|Message: Re: Spin Tracking in B-field||Not Logged In (login)|
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> >>> How do you identify the 'primary' e-; with: > >>> aTrack->GetParentID() == 0 > >>> and (&&) for good measure also: > >>> aTrack->GetTrackID() == 1 > > That's exactly what I do in SD, except I do not call > aTrack->GetTrackID()==1. Not 100% sure in here, but isn't it redundant -
Yes, it is redundant!
> So, first of, i used QGSP_BERT, which seems like it doens't contain > Polarization Physics - that was my mistake number 1!!!
You need polarization physics so that secondaries have imputed polarization 'at birth'. You don't need it to track the spin - of a polarized primary or secondary.
> But here are the issues I found after correcting Physics List: As you > suggested, I used /tracking/verbose 4: I attached just 2 snapshots for > e- primary and for gamma(one of the secondaries)... For e- primary, you > can notice that PreStep Polarization is set correctly, but the PostStep > one - by some reason it's 0.
"Somebody" (a process, it looks like in AlongStep and Transportation is the only active process) corrupts the polarization but only for the e- (with charge) and not the neutral photon.