Home » PANDA » PandaRoot » Tracking » Weird STT reconstruction: efficiency depends on charge
| Re: Weird STT reconstruction: efficiency depends on charge [message #5703 is a reply to message #5693] |
Fri, 25 January 2008 17:01   |
Andrew Savchenko
Messages: 6
Registered: January 2008
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occasional visitor |
From: *ikp.kfa-juelich.de
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Dear Pablo,
sorry for a long response, but I was busy a lot these days.
| Pablo Genova wrote on Wed, 23 January 2008 17:07 |
So try to svn-update the PndSttHelixTrackFitter and do again the reconstruction.
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Yes, this works thank you very much.
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Other observations:
->cross check of the variables
1. fParamLast.fTx*0.006 <--------> transverse momentum
[i. e. cbmsim->Draw("(fParamLast.fTx*0.006)"]
2.fParamLast.fTx*0.006*sqrt(1+fParamLast.fTy**2)) <------> total momentum
Do you agree?
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Yes, I do. This is mathematically equivalent to what I'm using now.
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->importance of fFlag==3 parameter
when you are looking at total reco, to get the only the events with the full reconstruction succeeded do like this:
cbmsim->Draw("(fParamLast.fTx*0.006)>>h2","fFlag==3")
in this way you select the events with fFlag==3 i. e. full success of the whole reconstructed procedure.
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Yes, this helps. But not absolutely. Even with a check for (GetFlag() == 3) I still can see this false peak at 90 degrees, but it become much smaller.
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It's certainly an interesting and not yet done study that of STT resolution at small theta angles, with or without MVD.
MVD + STT integration is also an interesting issue not yet tackled.
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Yeah, this should be investigated indeed, but later. Currently I will be out of work for several months due to technical reasons.
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If you need better explanation of the variables and the fitting procedure etc etc I can send you the presentations I made in the past and Lia's Phd Thesis (which, among other things, describes in detail the algorithm).
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OK, this will be useful, but later
Andrew
[Updated on: Fri, 25 January 2008 17:02] Report message to a moderator |
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