Home » PANDA » PandaRoot » General » GEANE: Propagate to Plane not implemented



Re: GEANE: Propagate to Plane not implemented [message #7414 is a reply to message #7413] 
Wed, 15 October 2008 10:42 
Lia Lavezzi
Messages: 291 Registered: May 2007 Location: Torino

firstgrade participant 
From: *pv.infn.it


Hi Tobias,
I think the cross product is correct, since in the PropagateToPlane(TVector3 &v0, TVector3 &v1, TVector3 &v2) you give as input the three vectors o, u and v.
They will be given to the EUFILP routine, which says to GEANE to "propagate to plane" in the Propagate(CbmTrackParP *TStart, CbmTrackParP *TEnd, Int_t PDG) function (as Mohammad said).
To do this a vector is filled Float_t plo[12], in this way:
TVector3 v1u=v1.Unit();
TVector3 v2u=v2.Unit();
// first vector on plane
plo[0]=v1u.X();
plo[1]=v1u.Y();
plo[2]=v1u.Z();
// second vector on plane
plo[3]=v2u.X();
plo[4]=v2u.Y();
plo[5]=v2u.Z();
// origin of the plane
plo[6]=v0.X();
plo[7]=v0.Y();
plo[8]=v0.Z();
// normal to the plane (the third vector to define the reference system u, v, w)
TVector3 v3=v1u.Cross(v2u);
plo[9]=v3(0);
plo[10]=v3(1);
plo[11]=v3(2);
So what did you exactly change?
Ciao,
Lia.




Re: GEANE: Propagate to Plane not implemented [message #7416 is a reply to message #7415] 
Wed, 15 October 2008 12:05 
Lia Lavezzi
Messages: 291 Registered: May 2007 Location: Torino

firstgrade participant 
From: *pv.infn.it


Quote: 
I modified the lines with plo[9] = v0.Dead), plo[10] = v0.Y(), plo[11].v0.Z().
Which is wrong but did not cause any harm, because v0 is orthogonal to v1 and v2.

...ok, just pay attention that you need the triplet v0, v1, v2 to be right handed...
Concerning the results you get, if you plot GeaneTrackPar.fX  GeaneTrackFinal.fX is it correct? I mean, is it centered at 0? Is there a problem only on the error calculation or also on the parameter value?
It' s not easy to understand what happens without looking at to code ... is your code in the svn repository? Can I have a look at (and maybe try to run) it, please?
Ciao,
Lia.







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