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Re: Weird STT reconstruction: efficiency depends on charge [message #5703 is a reply to message #5693] Fri, 25 January 2008 17:01 Go to previous messageGo to previous message
Andrew Savchenko is currently offline  Andrew Savchenko
Messages: 6
Registered: January 2008
occasional visitor
From: *ikp.kfa-juelich.de
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.


Yes, this works thank you very much.

Quote:


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?


Yes, I do. This is mathematically equivalent to what I'm using now.

Quote:


->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.


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.

Quote:


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.


Yeah, this should be investigated indeed, but later. Currently I will be out of work for several months due to technical reasons.

Quote:


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).


OK, this will be useful, but later

Andrew

[Updated on: Fri, 25 January 2008 17:02]

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