Two Silicon detectors with very different aims

100 MeV/c

100 MeV/c

p+

p -

• Measure charged multiplicity in 4p

• Multiplicity Detector

• Expected maximum charged particle of 10000

• global look at 108-109 events

• Sensor segmentation: df = 2p/32 . dh =0.06

• search for strong fluctuations

• Measure momentum and identify hadrons in the Spectrometer

• detailed analysis of 1% acceptance region for

  • particle ratios
  • Pt spectra
  • particle correlation

• Low pt acceptance and good particle identification

TYPICAL EVENT

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