1. DT Local Reconstruction on CRAFT data
9/11/2018
DT Local Reconstruction on CRAFT data
Plots for approval
DT-DPG meeting
18/6/09
n.b.: more detailed information on the plots can be found
on the note PAS linked in the Twiki page:
https: //twiki.cern.ch/twiki/bin/view/CMS/DTLocalRecoCRAFTPaper

2. 9/11/2018 MC
The plots show the reconstructed hit residuals in four DT stations with respect to the predicted position from the segment
extrapolation, after the determination of the arrival time of the cosmic muon in the chamber. Left column: data;
middle column: simulation. The scatter plots on the right show the residuals as a function of the local position in the DT cells.

3. 9/11/2018
Distribution of the fitted values of the reconstructed hit resolution in 246 DT chambers, after the
determination of the cosmic muon arrival time in the chamber. The blue entries are from chambers in
the vertical sectors of the Muon Barrel system, for which the incident angle of the muon track with
respect to the normal direction to the chamber is on average very large.

4. Efficiency to have a reconstructed hit in a DT cell crossed by
a cosmic muon as a function of the predicted muon
local position in the cell for the four different Muon Barrel
stations. The position of the anode wire is at x=0;
the I-beams separating contigous cells are positioned
at x= ± 2.1 cm.
9/11/2018

5. 9/11/2018
Effect of d-rays
Distribution of the difference between the distance to the cell
anode wire of the first hit recorded in a cell and the distance of
the extrapolated track position. The left-side tail in the plot is due
to d-rays passing nearer to the wire than the crossing muon.
The right-side tails originates from d-rays farer than the muon,
when the muon hit goes undetected. The x- coordinate has been
expanded to values larger than the cell size,
to show the effect of d-ray hits occurring in
the cell neighbouring to the one in which
there is the extrapolated prediction.

6. 9/11/2018
Left: multiplicity of associated hits to reconstructed segments in four Muon Barrel stations. Right: distribution of the
reconstructed local angle with respect to the direction normal to the chamber, for reconstructed cosmic muon
crossing the top sectors of the Muon Barrel system. Dots: data; full line histograms: simulation. The data-MC
discrepancy in the left plots is due to a slight difference in the hit association efficiency, which sum-up independently
for each of the 12 (8 for MB4 stations) layers. (see PAS note for more details)

7. Segment reconstruction efficiency in the r-f plane in the DT
9/11/2018
Segment reconstruction efficiency in the r-f plane in the DT
Muon Barrel chambers. Black: MB1, red: MB2, green: MB3,
blue: MB4.
Segment reconstruction
efficiency in the r-q plane

8. 9/11/2018 D
Bending angle differences between MB1 and MB2 stations (left plots) and
MB2 and MB3 stations (right plots) for muons of different trasverse momenta.
A gaussian fit to the pT = 30 GeV/c distribution is shown for both positive and
negative muons. The selected pT intervals for the different
distributions shown are [8, 12], [18, 22], [25, 35] and [90, 110] GeV/c respectively.

9. Fitted dispersion of the distribution of the bending angle
9/11/2018
Fitted dispersion of the distribution of the bending angle
differences between consecutive stations as a function
of the muon momentum. Full points: m+; open points: m-.
The dashed and dashed-dotted lines show the
Expectations from the multiple scattering between
MB1-MB2 and MB2-MB3 (or MB3-MB4 as well)
respectively.
Bending angle differences between MB1 and MB4 stations.
The selected pT interval for the pT = 200 GeV/c distribution
is [150, 250] GeV/c.

10. 9/11/2018
Back up

11. 9/11/2018
NOT
for approval