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Observation of direct processes in photoproduction at HERA

Physics Letters B 322:3 (1994) 287-300

Authors:

M Derrick, D Krakauer, S Magill, B Musgrave, J Repond, S Repond, R Stanek, RL Talaga, J Thron, F Arzarello, R Ayad, G Bari, M Basile, L Bellagamba, D Boscherini, A Bruni, G Bruni, P Bruni, G Cara Romeo, G Castellini, M Chiarini, L Cifarelli, F Cindolo, F Ciralli, A Contin, C Del Papa, S D'Auria, F Frasconi, P Giusti, G Iacobucci, G Laurenti, G Levi, Q Lin, G Maccarrone, A Margotti, T Massam, R Nania, C Nemoz, F Palmonari, G Sartorelli, R Timellini, Y Zamora Garcia, A Zichichi, A Bargende, J Crittenden, K Desch, B Diekmann, T Doeker, L Feld, A Frey, M Geerts, G Geitz, H Hartmann, D Haun, K Heinloth, E Hilger, HP Jakob, UF Katz, S Kramarczyk, M Kückes, A Mass, S Mengel, J Mollen, H Müsch, E Paul, R Schattevoy, JL Schneider, D Schramm, R Wedemeyer, A Cassidy, DG Cussans, N Dyce, B Foster, S George, R Gilmore, GP Heath, HF Heath, M Lancaster, TJ Llewellyn, CJS Morgado, JA O'Mara, RJ Tapper, SS Wilson, R Yoshida, RR Rau, M Arneodo, M Schioppa, G Susinno, A Bernstein, A Caldwell, I Gialas, JA Parsons, S Ritz, F Sciulli, PB Straub, L Wai, S Yang, P Borzemski, J Chwastowski, A Eskreys

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.
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The design and construction of the ZEUS central tracking detector

Nuclear Inst. and Methods in Physics Research, A 338:2-3 (1994) 254-283

Authors:

B Foster, J Malos, DH Saxon, DE Clark, AK Jamdagni, C Markou, DB Miller, DG Miller, LW Toudup, CG Auty, GA Blair, CB Brooks, RJ Cashmore, AT Hanford, N Harnew, AR Holmes, W Linford, NC Martin, IC McArthur, J Nash, KN Nobbs, RL Wastie, MT Williams, FF Wilson, RD Wilson, JC Hart, RW Hatley, JW Hiddleston, MD Gibson, NA McCubbin, A Middleton, MC Morrissey, D Morrow, P O'Brien, BT Payne, JCH Roberts, TB Shaw, CK Sinclair, EWG Wallis, DJ White, KL Yeo, FW Bullock, J Dumper, TJ Fraser, D Hayes, TW Jones, DE Strachan, IA Vine

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.
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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
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The Performance of the FADC System for the ZEUS Central Tracking Detector

IEEE Transactions on Nuclear Science 41:4 (1994) 1250-1254

Authors:

CJS Morgado, A Cassidy, D Cussans, B Foster, R Gilmore, HF Heath, J Malos, RJ Tapper, SA Baird, SB Galagadera, P Hardy, S Jaroslawski, R Matson, SPH Quinton

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 IEEE
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Timing and control system of the Zeus tracking detector data acquisition electronics

IEEE Nuclear Science Symposium & Medical Imaging Conference (1994) 514-517

Authors:

SB Galagedera, D Allen, SA Baird, I Church, P Hardy, S Jaroslawski, J Jarrett, R Matson, SPH Quinton, A Cassidy, D Cussans, HF Fawcett, B Foster, CJS Morgado, RJ Tapper

Abstract:

The Tracking Detector time resolution of 2ns and the 96ns periodic interaction of protons and electrons of the HERA collider require real time data acquisition at 104MHz controlled reliably to tight tolerances. Maximum event readout efficiency, fast monitoring of run time errors and testability of front end electronics require pipelining, speed and flexibility. Such an electronic Timing and control system (TCS) is operational within three main inner detectors of the ZEUS detector and is presented in this paper.