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Pixel beam test resolution studies: Summary & B data Update

Pixel beam test resolution studies: Summary & B data Update. G. Chiodini Feb 12, 2001 Monday pixel meeting. Resolution studies. Data ntuples aligned with the automatic procedure (provided by JC) Eta correction extracted from the data demanding CS ¹ 2 in plane 1 or 2.

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Pixel beam test resolution studies: Summary & B data Update

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  1. Pixel beam test resolution studies: Summary&B data Update G. Chiodini Feb 12, 2001 Monday pixel meeting G. Chiodini - Feb 12, 2001 - Fermilab

  2. Resolution studies • Data ntuples aligned with the automatic procedure (provided by JC) • Eta correction extracted from the data demanding CS¹2 in plane 1 or 2. • Resolution has been measured demanding CS=2 in plane 1 and 2. • Statistical errors provided by the Kalman filter for each run with the incorrect material and beam energy (0.98 correction factor for FPIX0 ) and the incorrect intrinsic plane error (0.88 correction factor from the pull distribution for FPIX0). • Alignment errors estimated in one run for some parameters (FPIX0 pstop 10 degs) from the automatic procedure (provided by JC). G. Chiodini - Feb 12, 2001 - Fermilab

  3. Resolution uncertainty • Several sources of uncertainty affect the resolution: • The definition itself: Resolution = Gaussian width of the measured residual with the statistical error subtracted in quadrature(the residual distribution is not Gaussian at small track angle and always shows not Gaussian tails) • The histogram bin size and fit range add an uncertainty of about 2% in the Gaussian width of the measured residual. • The alignment parameter adds an uncertainty of about 1.2% in the Gaussian width of the measured residual . • The statistical error from is likely to be about 5% uncertain. G. Chiodini - Feb 12, 2001 - Fermilab

  4. Systematic alignment error:FPIX0 pstop 10 degs (10Kevents) High precision X SSD Plane 1 is considered as the reference plane. The dominant error contribution is from the x high SSD plane 2

  5. Some definition… • srm = the measured residual spread: • Gaussian fit • srp = the telescope error impact point: • (from the Kalman filter) * 0.863 (1.13 for FPIX1) • ssrm = the uncertainty on srm : • Gaussian fit + 2% histogram parameter + (1.16%)*angle/10 alignment error • ssrp = the uncertainty on srp (0.1 um spread from the Kalman filter) Pixel resolution Error on the pixel resolution applying the error propagation law: G. Chiodini - Feb 12, 2001 - Fermilab

  6. Resolution Table: FPIX0-pstop The results from manual alignment analysis are shown in brackets. G. Chiodini - Feb 12, 2001 - Fermilab

  7. Resolution Table: FPIX0pspray The results from manual alignment analysis are shown in brackets. G. Chiodini - Feb 12, 2001 - Fermilab

  8. The results from manual alignment analysis are shown in brackets. Resolution Table: FPIX1pstop G. Chiodini - Feb 12, 2001 - Fermilab

  9. Linear eta function: FPIX0-pstop A change of about 15% in the linear eta function slope induces a change of about 5% in the residual width. G. Chiodini - Feb 12, 2001 - Fermilab

  10. B data update: Comparison Eta distribution (1) Magnetic field setup FPIX0 in central box eta qleft G. Chiodini - Feb 12, 2001 - Fermilab

  11. B data update: Comparison Eta distribution (2) No evidence of an increased threshold in B data from eta distribution G. Chiodini - Feb 12, 2001 - Fermilab

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