Charged Particle Density

Four counting methods

• Tracking detectors - h ? 0 measurements

  • Tracklets in Spectrometer
  • Tracklets in Vertex detector

• Single layer detectors - 4? measurements

  • Use deposited energy (dE/dx) in each Si-pad
  • Count hits above threshold, assume Poisson-statistics

All four measurements corrected for:

secondary particles, feed-down from weak decay, stopping particles

Systematic uncertainty:

from 4.5% (Tracklets in Spectrometer) to 10% (Hit counting)

All four methods deliver consistent results - final results averaged

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