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Observation of jet production in deep inelastic scattering with a large rapidity gap at HERA

Physics Letters B 332:1-2 (1994) 228-243

Authors:

M Derrick, D Krakauer, S Magill, B Musgrave, J Repond, J Schlereth, R Stanek, RL Talaga, J Thron, F Arzarello, R Ayad, G Bari, M Basile, L Bellagamba, D Boscherini, A Bruni, G Bruni, P Bruni, GC Romeo, G Castellini, M Chiarini, L Cifarelli, F Cindolo, F Ciralli, A Contin, S D'Auria, C Del Papa, F Frasconi, P Giusti, G Iacobucci, G Laurenti, G Levi, G Maccarrone, A Margotti, T Massam, R Nania, C Nemoz, F Palmonari, G Sartorelli, R Timellini, YZ 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, A Mass, S Mengel, J Mollen, E Paul, C Rembser, R Schattevoy, JL Schneider, D Schramm, J Stamm, R Wedemeyer, S Campbell-Robson, A Cassidy, N Dyce, B Foster, S George, R Gilmore, GP Heath, HF Heath, TJ Llewellyn, CJS Morgado, DJP Norman, 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, K Piotrzkowski

Abstract:

Events with a large rapidity gap in deep inelastic scattering with Q2 ≥ 10 GeV2 have been studied in the ZEUS detector. The properties of these events with W > 140 GeV are consistent with a leading twist diffractive production mechanism. In the laboratory frame, with ETjet ≥ 4 GeV, 15% of the events are of the 1-jet type with negligible 2-jet production. The single jet is back-to-back in azimuth with the scattered electron. No energy flow is observed between the jet and the proton direction. With a lower jet transverse energy cut 2-jet production is observed both in the laboratory and the γ* p centre-of-mass systems, demonstrating the presence of hard scattering in the virtual photon proton interactions that give rise to large rapidity gap events. © 1994.
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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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