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Re: alternative to LHE tracking [message #11376 is a reply to message #11348] Tue, 21 December 2010 14:56 Go to previous message
Radoslaw Karabowicz is currently offline  Radoslaw Karabowicz
Messages: 108
Registered: June 2004
Location: GSI
continuous participant
From: *
Dear All, you are absolutely right. I have tested it yesterday, and the track fitting with Kalman/genfit works good, but slow:(.

Anyways, I have spotted and fixed two bugs:
- theta comparison now is taken into account when calculating efficiency
- particle charge is now correctly associated to track

I have also created histograms showing momentum resolution as functions of momentum magnitude, phi and theta. The first two dependences look rather OK, but for the smallest theta angles (in the region of GEM) the reconstructed momentum is... well, ugly.

The following plot base on the momentum as taken after the track finder, without fit.
The histograms are 2D, with X axis being the momentum, phi or theta, and Y axis being the momentum resolution. The histogram is then sliced and to each slice a gaussian function is fitted. The sigma of the fit is plotted as the black curve.


The simple change of the macro to include the genfitter:
FairGeane *Geane = new FairGeane();
PndRecoKalmanTask* recoKalman = new PndRecoKalmanTask();
Works and fits the tracks. Below is the histogram showing the reconstructed momentum after PndBarrelTrackFinder (black curve) and after the fit applied (red curve). In this particular case 2 GeV muons were simulated.


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