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General U.S. ATLAS Physics, Software & Computing Sections Run 003007 (DC 2) version 10.0.1 Run 003014 (DC 2) version 10.0.1 Run 005001 (CSC) version 12.0.3 Run 005144 (CSC) version 12.0.3 For the Run 005144 with software version 12.0.3: Zee Rec. Analysis 2 (Track efficiency and rec) |
Some other important details about Zee ReconstructionContinuing the investigation on the Zee problem, we start to look at the tracks formed by the Zee events. We remember that now the Tracks software being used is now Trk::Tracks and the end of the Tracks is now being studied by ExtrapolatorToCalo. You may want to explore the efficiencies of these tracks and the Pt recovery of the tracking reconstruction algorithm. For that, please, look at these web pages. For the tracks, we first investigate the tracks multiplicity : Also, we first investigate the tracks multiplicity for different
Pt cuts (2 GeV, 5 GeV, 10 GeV) : Tracks Impact parameters (The tracks with abs(Impact) greater
than 35 have abs(Vertex Eta) greater than 2) : Tracks Z0 versus Impact parameter (Is that the beam spot?!): For the tracks we can see now the Pt curve from 0 to 10 GeV. This
can be compared with the :
Also, we can compare the profile at very low Pt. As one can see, the
peak found at the truth analysis is moved to higher Pt than the peak
found at the Stable Charged Particles distribution. This can be understood
looking at the reconstruction efficiency :
Their Eta distribution of the tracks (weirdly peaking at eta=2.5) :
An uniform Phi distribution (as expected) : Also, we investigate the Eta difference distribution for the beginning of the track (Vertex) and at the extrapolated, by the ExtrapolatorTool tool, position at the EM calorimeter entrance.
Since the magnetic field is in the beam direction there is
no distortion in the Eta direction for the beam.
However, when looking at the Phi direction, the displacement is clearly
influenced by the charge and the momentum of the particle :
Of course, this displacement has a strong correlation with the momentum.
In the next plot, we have Delta Phi correlated with momentum : One can see the bending related to the Pt of the track, as it should be expected but just to some of the higher Pt tracks. |