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| Re: GEM tracking [message #8227 is a reply to message #8221] |
Wed, 15 April 2009 16:03   |
Radoslaw Karabowicz
Messages: 108
Registered: June 2004
Location: GSI
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continuous participant |
From: *gsi.de
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Yes, one of the two hit coordinates I set always to zero, while the other is set to the radius distance of the hit to the center. The errors are then corresponding to the error in radius (hit->GetDr()), and error perpendicular to it (hit->GetDp()).
Concequently, the whole DetectorPlane is rotated by the angle of the hit. I hope I did it right, at least the track position (trk->getPos() corresponds to the point I have insterted there.
Don't I do it correctly?, first setting the vectors uu and vv:
TVector3 oo (0.,0.,hit->GetZ()),
uu ( TMath::Sin(phiAValue), TMath::Cos(phiAValue),0),
vv ( TMath::Cos(phiAValue),-TMath::Sin(phiAValue),0);
and then setting the detector plane using the vectors:
setDetPlane(DetPlane(oo,uu,vv));
I hope it was tested before.
I wanted to have the errors expressed in Dr and Dp, as it seemed to me the best choise.
yours,
radek
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