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Different configuration of the Pixel Detector have been studied to determine which one would be the best to have a good resolution for pt and impact parameters for tracks. For the tracks we are interested in the pt range compatible with the one of tracks coming from a b-hadron decay (pt~ 3.5 GeV).
We bin our measurement in 4 pt region: 1 Gev,2 GeV, 5GeV ,20 GeV. And we consider 3 eta region: C ( eta< 0.8), I (eta< 1.6), F (eta<2.4).
We use different scenarios:
TP- Technical Proposal: 4 Layers for the BP with pixel with the same resolution as the Run I in Phase I (13 um X 28 um); sensor: 100 um x 150 um, thickness T=0.3 mm ; innermost layer at 3 cm from the beampipe and the outermost layer 16.1 cm.
TP with outer layer at 18.8 cm.
TP but one layer (the 3rd one at radius=10.9 cm) removed.
TP with better resolution (7um x 15 um) sensors in first layer.
TP with better resolution (7um x 15 um) sensors in first layer (sensor thickness = 0.225 in the first Layer). [ If the pixel size is decrezed 75 um x 100 um, to have the same charge sharing between pixel that we have in the Run I, the thickness shoud be reduced]
TP with better resolution (7um x 15 um) sensors in first layer, increasing material of the first layer [ the better resolution pixel has an area that is half compared to the Run I pixel. So in the same detector there will be a double number of pixel and an increase of the material, especially for the read-out].
TP with better resolution (7um x 15 um) sensors in all 4 layers, (pixel thickness =0.225 in all Layers).
TP with better resolution (7um x 15 um) sensors in all 4 layers, increasing material in all layers.
Strawman5 configuration is expalind in https://test-lantonel-tklayout.web.cern.ch/test-lantonel-tklayout/Strawman_5/indexpixel.html (with material changes in the tracker, intermediate sensor technology)
Strawman5, with better sensors in 2 layers, TP sensors in 2 layers Strawman5, with better sensors in 2 layers, TP sensors in 2 layers, (pixel thickness =0.225 in 2 layers) TP with nPix x 4
