dNch/d? at mid-rapidity: |?|ə

Tracklet counting method (2 Si layers)

Tracklets ? three-point tracks

two-hit combinations+measured event vertex

• ?x ~ 450 ?m

• ?y ~ 200 ?m

• ?z ~ 200 ?m

Spectrometer

Vertex Detector

D = (??2 + ??2) 1/2 < 0.015

|??| < 0.04 , |??| < 0.3

The measurements in the two different Si pad detectors

(different location, granularity, acceptance, systematics)

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