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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

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

Attachment: EfficiencyComparison.jpg
(Size: 43.80KB, Downloaded 382 times)
Attachment: chi2.jpg
(Size: 80.37KB, Downloaded 450 times)

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

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[Message index]

		Momentum resolution and reconstruction efficiency of LHE tracking By: David Pohl on Wed, 10 February 2010 19:21
		Re: Momentum resolution and reconstruction efficiency of LHE tracking By: StefanoSpataro on Wed, 10 February 2010 21:05
		Re: Momentum resolution and reconstruction efficiency of LHE tracking By: Gianluigi Boca on Wed, 10 February 2010 23:18
		Re: Momentum resolution and reconstruction efficiency of LHE tracking By: Johan Messchendorp on Wed, 10 February 2010 23:49
		Re: Momentum resolution and reconstruction efficiency of LHE tracking By: StefanoSpataro on Thu, 11 February 2010 00:21
		Re: Momentum resolution and reconstruction efficiency of LHE tracking By: Johan Messchendorp on Thu, 11 February 2010 00:30
		Re: Momentum resolution and reconstruction efficiency of LHE tracking By: StefanoSpataro on Thu, 11 February 2010 07:47
		Re: Momentum resolution and reconstruction efficiency of LHE tracking By: Johan Messchendorp on Thu, 11 February 2010 09:47
		Re: Momentum resolution and reconstruction efficiency of LHE tracking By: StefanoSpataro on Thu, 11 February 2010 10:05
		Re: Momentum resolution and reconstruction efficiency of LHE tracking By: David Pohl on Thu, 11 February 2010 10:43
		Re: Momentum resolution and reconstruction efficiency of LHE tracking By: StefanoSpataro on Thu, 11 February 2010 11:05
		Re: Momentum resolution and reconstruction efficiency of LHE tracking By: David Pohl on Thu, 11 February 2010 11:15
		Re: Momentum resolution and reconstruction efficiency of LHE tracking By: StefanoSpataro on Thu, 11 February 2010 11:20
		Re: Momentum resolution and reconstruction efficiency of LHE tracking By: StefanoSpataro on Thu, 11 February 2010 12:49
		Re: Momentum resolution and reconstruction efficiency of LHE tracking By: David Pohl on Thu, 11 February 2010 14:22
		Re: Momentum resolution and reconstruction efficiency of LHE tracking By: asanchez on Thu, 11 February 2010 14:34
		Re: Momentum resolution and reconstruction efficiency of LHE tracking By: asanchez on Thu, 11 February 2010 14:49
		Re: Momentum resolution and reconstruction efficiency of LHE tracking By: Lia Lavezzi on Thu, 11 February 2010 15:19
		Re: Momentum resolution and reconstruction efficiency of LHE tracking By: asanchez on Thu, 11 February 2010 15:35
		Re: Momentum resolution and reconstruction efficiency of LHE tracking By: Anonymous Poster on Thu, 11 February 2010 15:46
		Re: Momentum resolution and reconstruction efficiency of LHE tracking By: Alberto Rotondi on Thu, 11 February 2010 18:51
		Re: Momentum resolution and reconstruction efficiency of LHE tracking By: Gianluigi Boca on Sat, 13 February 2010 23:06

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