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Tracking and particle identification detectors

Closest to the interaction point are the transparent tracking detectors, that make non-destructive measurements of the particle trajectories through the detector. At the very center of DELPHI is the vertex detector (VD) [2], which measure the vertex of the interaction point very precisely (a R$\phi$ resolution of 8 $\mu$m and a z resolution of 18 $\mu$m). The vertex detector is surrounded by the Inner Detector (ID) [3], which covers tracks between 15^o and 165^o in $\theta$. The detector is a drift chamber giving 24 R$\phi$ points per track with a resolution of 60$\mu$m in R and 1.5 mrad in $\phi$.

The main tracking detector of DELPHI is called TPC (Time Projection Chamber) [4]. It consists of two 1.5 meters long cylindrical chambers covering a radius between 40 and 120 cm on each side of the interaction point. The TPC makes a three dimensional track reconstruction with 16 spacial points with a resolution of 230 $\mu$m in R$\phi$ and 0.9 mm in z. Charged particle identification is achieved with dE/dx in the TPC and the radiation of light emitted by particles faster than light in the Ring Imaging Counter. The Outer Detector (OD) [5], Forward Chamber A and B (FCA and FCB) [6] are the outer most tracking devices and improve the momentum determination and give fast trigger information.