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Thoughts on Moving the Outer Layer of the Pixel Detector to 8 cm Radius Jim Thomas

Thoughts on Moving the Outer Layer of the Pixel Detector to 8 cm Radius Jim Thomas Lawrence Berkeley National Laboratory August 2 nd , 2007. Relative Pointing Resolution at the Vertex. The first layer of the pixel detector held at 2.5 cm radius

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Thoughts on Moving the Outer Layer of the Pixel Detector to 8 cm Radius Jim Thomas

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  1. Thoughts on Moving the Outer Layer of the Pixel Detector to 8 cm Radius Jim Thomas Lawrence Berkeley National Laboratory August 2nd, 2007

  2. Relative Pointing Resolution at the Vertex • The first layer of the pixel detector held at 2.5 cm radius • The second layer of the pixel detector at 3, 4, 5, 6, 7, 8, 9 cm

  3. Efficiency Calculations (ala HHW and GvB) P(good) = 1 / (1+S) where S = 2xy P(bad) = (1 – Efficiency) = S / ( 1 + S ) and when S is small P(bad)  2xy x is the convolution of the detector resolution and the projected track error in the ‘x’ direction, y is the convolution of the detector resolution and the projected track error in the ‘y’ direction, and  is the density of hits. The largest error dominates the sum x =  ( 2xp + 2xd ) y =  ( 2yp + 2yd ) Asymmetric pointing resolutions are a challenge

  4. Relative Efficiencies for Single Tracks and D0s • The first layer of the pixel detector held at 2.5 cm radius • The second layer of the pixel detector at 3, 4, 5, 6, 7, 8, 9 cm

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