| Study of tracking efficiency and resolution [message #14046] |
Tue, 02 October 2012 22:21  |
donghee
Messages: 385
Registered: January 2009
Location: Germnay
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first-grade participant |
From: *dip.t-dialin.net
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Hi PANDAroot experts,
I'm posting my simulation macros for track reconstruction study which I have shown in the PANDAroot meeting at 2.Oct.
Also, the presentation is enclosed in this post.
In this study, I tried to show the resolution and efficiency of single particle using both target and forward track reconstruction.
I am afraid that I was going the wrong way while doing this test.
Please let me know if you find something wrong in this macros.
I used the july12 release version of PANDAroot.
I would like to understand two issues.
How will the resolution be improved when the forward track is added into the track reconstruction. (A bug is in the analysis macro?)
Why the efficiency of low momentum tracks are significantly dropped down in the region of theta > 90 degree (backward directed track).
ps, I don't know how can I put these files via SVN...
Thank you for your interest and help in advance.
Donghee
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| Re: Study of tracking efficiency and resolution [message #14109 is a reply to message #14049] |
Fri, 12 October 2012 12:03  |
donghee
Messages: 385
Registered: January 2009
Location: Germnay
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first-grade participant |
From: *kph.uni-mainz.de
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Hi stefano,
I found a reason for the inefficiency of 10 degree track.
When I studied tracking performance, I produced a point particle at exactly 10 deg. It was presented in last meeting.
When I produce single track in the range 0.5 and 20 deg with 1-5 GeV momentum as a continuous spectrum,
I can see correct tracks from both spectrometer (forward and target).
The combined track in Pid session is working properly.
But at 5 deg starts droping down the efficiency till 10 degree.
the reconstruction at 10 deg is quite inefficient due to some reasons, material effect or mainly rough connection of both tracklet in the overlap region between target and forward spectrometer.
I'm not surprising the reason for inefficiency at 10 deg at all.
I'm trying to answer now for next question about inefficiency of backward part with low momentum (~ 300 MeV/c track).
Best regards,
Donghee
[Updated on: Fri, 12 October 2012 12:06] Report message to a moderator |
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| Re: Study of tracking efficiency and resolution [message #14110 is a reply to message #14109] |
Fri, 12 October 2012 12:39 |
StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino
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first-grade participant |
From: *to.infn.it
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Hi Donghee,
I am not surprised of such effect.
Indeed, we have a central tracker code wich covers mvs+stt+gem, and a forward tracker covering mvs+gem+fts. In between these regions, tracks should be seen only by mvd+gem, w/o stt and w/o fts, and both the already existing code cannot be used. The mvd+gem code is existing, written by Radek, but never raccomended.
If you consider that the coverage of fts is an ellipse wiht 5° and 10° as axis, I believe that between 5° and 10° acceptance decreases. If you could select one theta, i.e. 7.5°, and plot as a function of phi, I believe you could see such obscillations.
Probably we would need to start thinking about also such region.
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