General plots
Matching

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STAR SSD

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OfflineQA plots description
You can right click on the impages below to enlarge them.

General plots (all the SSD at once)

StE*QAPointXYSvt
Distribution of SSD hits in transverse plan
The SSD layer take places at a radius ~ 23 cm.
StE*QAPointSizeSSD
Size of clusters
The size is in number of strips. We write only the size up to 4 strips so the last bin (size = 4 strips) may contain clusters which size is higher than 4.
StE*QAPointLWSSD
Number of reconstructed hits in each wafer
The x-axis represents the ladder Id ; the y-axis the wafer Id.
StE*QaPointESSD
Energy Loss
It represents the energy of reconstructed hits in GeV (here plotted as log10)
for MIP's one expect a energy deposit of 110 keV in 300 &mu m of silicon.
StE*QaPointPhiSSD
&phi Distribution of hits
It represents the &phi distribution of hits
StE*QaPointPhiSSD[2]
&phi Distribution of hits [2]
The same as above but normalized and with the label of each ladder.
(shaded boxes are roughly to indicate the range of the ladder in &phi)


Matching plots

StE*QaGtrkPhifSSD
&phi of globals tracks with a ssd point fitted
We select 'good tracks'(roughly in the SSD acceptance) and with a minimum of points in TPC to evaluate this effiency:
  • |Zvertex| < 10 cm
  • Number of TPC hits > 15
  • |&eta|<1
StE*QaPtrkPhifSSD
&phi Distribution of primary tracks
Same conditions than the globals tracks.


ssd back button Jonathan.Bouchet