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Re: Momentum resolution and reconstruction efficiency of LHE tracking [message #10180 is a reply to message #10178] Thu, 11 February 2010 14:22 Go to previous messageGo to previous message
David Pohl is currently offline  David Pohl
Messages: 18
Registered: October 2009
Location: FZ Juelich
occasional visitor

From: *ikp.kfa-juelich.de
hi Stefano,

I did the simulation again with your changes. In the region between 150-350 MeV/c the reconstruction
efficiency is much better:

STT reco efficiency with and without helix fit
index.php?t=getfile&id=5842&private=0

Ok, if you say that the reconstruction efficiency is that bad due to the higher energy loss in the low momentum
region I can understand this. The helix should look more like a spiral and this leads Lhe to fail, right?
But the other thing is how to identify if a track fit is good. When you look at the third picture in my first post,
you can see that I have a lot of background (error > 3 sigma, 40% events). These events cannot be used for PID.
I thought that the Chi square of a PndTrack should be a good indication for the goodness of the momentum
resolution but sadly the values are not correlated:

Chi Square, p is transverse momentum
index.php?t=getfile&id=5843&private=0

greetings,
David

[Updated on: Thu, 11 February 2010 14:22]

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