Observation of direct processes in photoproduction at HERA
Physics Letters B 322:3 (1994) 287-300
Abstract:
Jets in photoproduction events have been studied with the ZEUS detector for γp centre-of-mass energies ranging from 130 to 250 GeV. The inclusive jet distributions give evidence for the dominance of resolved photon interactions. In the di-jet sample the direct processes are for the first time clearly isolated. Di-jet cross sections for the resolved and direct processes are given in a restricted kinematic range. © 1994.The design and construction of the ZEUS central tracking detector
Nuclear Inst. and Methods in Physics Research, A 338:2-3 (1994) 254-283
Abstract:
The mechanical, electrical and electronic design and construction of the ZEUS central tracking detector are described, together with the chamber monitoring and environmental control. This cylindrical drift chamber is designed for track reconstruction, electron identification and fast event triggering in a high beam-crossing rate, high magnetic field application. © 1994.The design, status and performance of the ZEUS central tracking detector electronics. by D.G. Cussans et al. [Nucl. Instr. and Meth. A 315 (1992) 397-403]
Nuclear Inst. and Methods in Physics Research, A 338:2-3 (1994) 585
The Performance of the FADC System for the ZEUS Central Tracking Detector
IEEE Transactions on Nuclear Science 41:4 (1994) 1250-1254
Abstract:
The Central Tracking Detector (CTD) of the ZEUS experiment uses a Flash Analogue to Digital Converter (FADC) readout system to measure the arrival time of ionisation at sense wires as well as the charge deposited. A digitisation frequency of 104 MHz is used and the data is written to pipelined data stores. A Digital Signal Processor (DSP) is used to control the main functions on the card as well as perform data parameterisation and compression. Test and operational performance results from the first electron-proton interactions are presented. © 1994 IEEETiming and control system of the Zeus tracking detector data acquisition electronics
IEEE Nuclear Science Symposium & Medical Imaging Conference (1994) 514-517