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Understanding dE/dx in the ITS: Performance, Calibration, and Comparison with TPC

Exploring the current status and general considerations of dE/dx in the ITS at Utrecht University. Performance metrics like truncated mean and resolution, calibration processes, and comparison with TPC are discussed. Proton peak scale, resolution, and final comments on ITS PID performance, calibration stability, and resolution are highlighted. dE/dx in ITS is deemed suitable for low pT and standalone tracking applications.

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Understanding dE/dx in the ITS: Performance, Calibration, and Comparison with TPC

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  1. dE/dx in the ITS Current status/experience General considerations Marco van Leeuwen, Utrecht University

  2. dE/dx performance Truncated mean Lowest 50% of points Standalone Global tracks Tracks with 3, 4 points Resolution 10-15% Worse for standalone tracking than combined tracking (effect of mom resolution)

  3. SDD calibration Drift time dependence Module by module Calibration precision ~1% rather straightforward

  4. SSD Calibration P vs N calibration Module by module P-N asymmetry due to asymmetric shaper voltage (corrected by now) Detector response relativelyuniform before calibration Calibration to ~1% rather straightforward

  5. Comparison to TPC ITS ITS TPC • Proton peakoff scale TPC resolution ~5% much better than ITS ~12% (more samples)

  6. Final comments • ITS PID performs well • Calibration straightforward, stable • Resolution close to MC-expected • NB: most of pT-reach overlaps with TPC • ITS dE/dx mostly niche application: low pT, standalone tracking

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