The HERA-B high-p/sub T/ trigger

The high-p/sub T/ trigger to select tracks with high transverse momenta has been developed. The concept, design criteria, and system components are described. A dedicated data processing (pretrigger logic) system has been developed to select and process in real time pretrigger signals out of 3/spl times/10/sup 12/ combinations per second. The operational performance of the data-processing system and other components of the trigger system are presented.