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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
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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.

Yes, this works thank you very much.


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.


->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:


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.


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.


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


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

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