THE ZEUS MICROVERTEX DETECTOR

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Abstract
A new silicon microvertex detector (MVD) will be installed in the ZEUS experiment during the 2000 HERA luminosity upgrade. Such a high precision detector will improve the global tracking system and allow to identity events with secondary vertices originating from the decays of long-lived states. It will be placed in the proximity to the beam pipe to surround the interaction region. The barrel part is a 60 cm long cylinder consisting of three double layers of single-sided silicon detectors, the forward part is made of four double shaped layers, called wheels, extending 42 cm along the beam. A test beam has been setup in order to characterize the performance of the detector modules and readout electronics (i.e. track position resolution, signal to noise ratio, detection efficiency). The detector layout and some selected test beam results are presented.

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