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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)