Pp Pd Fl

1 Introduction The Crystal Barrel Vertex Detector presently at CERN, Div. PPE, Gen`eve; email: Christian.Regenfus@cern.ch CB-Note 306 C. Regenfus Sektion Physik, Universitat Munchen, D-85748 Garching September 20, 1996 a single-sided-strip detector with backplane readout for fast trigger applications The Crystal Barrel Detector [1] was designed for a complete reconstruction of and annihilation events. The final state particles are mainly pions, kaons and 's in typical momentum ranges between 0.1 . . . 1 GeV/c. Photons are detected in the 1380 CsI crystals of the electromagnetic calorimeter, the tracking of charged particles is done by means of a 23-layer cylindric jet drift chamber (JDC). The new Si- -strip vertex detector (SVX) replaces a two layer proportional chamber. Its main purpose is to povide a high-acceptance trigger[2] 1 Motivated by a project to trigger on the charged decay of neutral strange particles, a single-sided Si- -strip vertex detector (SVX) has been placed in v..