Home » PANDA » PandaRoot » Tracking » back-propagation with GEANE
| Re: back-propagation with GEANE [message #10709 is a reply to message #10706] |
Wed, 19 May 2010 19:25   |
StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino
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first-grade participant |
From: *to.infn.it
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Hi,
I would use use:
fPro->SetPoint(vtx);
fPro->PropagateToPCA(1,-1);
fPro->Propagate(fStart, fRes, PDGCode);
instead of:
fPro->SetPoint(vtx);
fPro->BackTrackToVirtualPlaneAtPCA(1);//1 means "closest approach to point"
fPro->Propagate(fStart, fRes, PDGCode);
I am not sure the function BackTrackToVirtualPlaneAtPCA is the one you need, but I sould wrong.
What are you using as StartO, StartU, StartV?
Another comment:
PndMCTrack* myTrack = (PndMCTrack*)(fMCTracks->At(0));
//Get Start point and momentum from MC
PndSdsMCPoint* mcPoint = (PndSdsMCPoint*)(fMCHits->At(0));
I am not sure if this works. You should ask that mcPoint and mcTrack are the same particle: mcPoint->GetTrackID()==0. Without this check, you could also take some secondary and call them "antiprotons".
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