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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 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].
Strawman5, with better resolution (7um x 15 um) sensors in 2 innermost ( and extension ) layers, Phase I resolution (13 um x 28 um) sensors in 2 layers, (pixel thickness =0.225 in 2 layers).
The results are reported in the tables: file:///Users/cgalloni/Phase2Upgrade/tklayout/TechnicalProposal2014_Just3Layers/index.html