Counting:
•Restrict the location of
collisions vertex to the region in which the silicon detectors had good acceptance
•Tracklets: 3 point tracks
passing through firs four layers of spectrometer (SPEC) or from vertex detector
(VTX)
Determination
of number of primary particles from tracklets:
•Primaries are all charged
hadrons produced in collision, including products from strong
interactions and electromagnetic decays but excluding products from weak decays and
hadrons produced
in secondary interactions
Determination
of systematic errors
Charged multiplicity measurement
