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Observation of hard scattering in photoproduction at HERA

Physics Letters B 297:3-4 (1992) 404-416

Authors:

M Derrick, D Krakauer, S Magill, B Musgrave, J Repond, K Sugano, R Stanek, RL Talaga, J Thron, F Arzarello, R Ayed, G Barbagli, G Bari, M Basile, L Bellagamba, D Boscherini, G Bruni, P Bruni, G Cara 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, Q Lin, B Lisowski, G Maccarrone, A Margotti, T Massam, R Nania, C Nemoz, F Palmonari, G Sartorelli, R Timellini, Y Zamora Garcia, A Zichichi, A Bargende, F Barreiro, J Crittenden, H Dabbous, K Desch, B Diekmann, M Geerts, G Geitz, B Gutjahr, H Hartmann, J Hartmann, D Haun, K Heinloth, E Hilger, HP Jakob, S Kramarczyk, M Kückes, A Mass, S Mengel, J Mollen, H Müsch, E Paul, R Schattevoy, B Schneider, JL Schneider, R Wedemeyer, A Cassidy, DG Cussans, N Dyce, HF Fawcett, B Foster, R Gilmore, GP Heath, M Lancaster, TJ Llewellyn, J Malos, CJS Morgado, RJ Tapper, SS Wilson, RR Rau, A Bernstein, A Caldwell, I Gialas, JA Parsons, S Ritz, F Sciulli, PB Straub, L Wai, S Yang, T Barillari, M Schioppa, G Susinno, W Burkot, J Chwastowski, A Dwuraźny, A Eskreys

Abstract:

We report a study of electron proton collisions at very low Q2, corresponding to virtual photoproduction at centre of mass energies in the range 100-295 GeV. The distribution in transverse energy of the observed hadrons is much harder than can be explained by soft processes. Some of the events show back-to-back two-jet production at the rate and with the characteristics expected from hard two-body scattering. A subset of the two-jet events have energy in the electron direction consistent with that expected from the photon remnant in resolved photon processes. © 1992.
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A measurement of σtot(γp) at S = 210 GeV

Physics Letters B 293:3-4 (1992) 465-477

Authors:

M Derrick, D Krakauer, S Magill, B Musgrave, J Repond, K Sugano, R Stanek, RL Talaga, J Thron, F Arzarello, R Ayed, G Barbagli, G Bari, M Basile, L Bellagamba, D Boscherini, 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, Q Lin, B Lisowski, G Maccarrone, A Margotti, T Massam, R Nania, C Nemoz, F Palmonari, G Sartorelli, R Timellini, Y Zamora Garcia, A Zichichi, A Bargende, F Barreiro, J Crittenden, H Dabbous, K Desch, B Diekmann, M Geerts, G Geitz, B Gutjahr, H Hartmann, J Hartmann, D Haun, K Heinloth, E Hilger, HP Jakob, S Kramarczyk, M Kückes, A Mass, S Mengel, J Mollen, H Müsch, E Paul, R Schattevoy, B Schneider, JL Schneider, R Wedemeyer, A Cassidy, DG Cussans, N Dyce, HF Fawcett, B Foster, R Gilmore, GP Heath, M Lancaster, TJ Llewellyn, J Malos, CJS Morgado, RJ Tapper, SS Wilson, RR Rau, A Bernstein, A Caldwell, I Gialas, JA Parsons, S Ritz, F Sciulli, PB Straub, L Wai, S Yang, T Barillari, M Schioppa, G Susinno, W Burkot, J Chwastowski, A Dwuraźny, A Eskreys

Abstract:

The total photoproduction cross section is determined from a measurement of electroproduction with the ZEUS detector at HERA. The Q2 values of the virtual photons are in the range 10-7
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Influence of cavity configuration on the pulse energy of a high-pressure molecular fluorine laser

Applied Physics B Photophysics and Laser Chemistry 55:1 (1992) 54-59

Authors:

SM Hooker, AM Haxell, CE Webb

Abstract:

We report an investigation of a high-pressure molecular fluorine laser operating at 158 nm. Several cavity configurations were studied, including one employing a roof prism as the high reflector. A maximum VUV pulse energy of 237 mJ, corresponding to a specific output of 3.3 J/1 was obtained when the laser was operated as a double-ended device. With single-ended operation the largest output energy was 176 mJ at a specific output of 2.5 J/1. © 1992 Springer-Verlag.
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Determination of the gain coefficient of an no iaser at 218 nm

Journal of Physics D: Applied Physics 25:4 (1992) 593-596

Authors:

AM Haxell, SM Hooker, CE Webb

Abstract:

We have observed laser oscillation on the B’2Δ-X2n (3-10) and (3-11) transitions of an F2 laser pumped nitric oxide laser. The maximum total output pulse energy was 280μJ. We present here the results of an investigation to determine the maximum intra-cavity loss which still allows laser oscillation to occur in this system. This information has been used to find the effective gain coefficient of the NO laser, operating on the B’2Δ-X2n (3-10) transition at 218 nm by applying the condition for cw laser oscillation. The effective cw gain coefficient was found to be 0.25 cm-1 for pump laser intensities of 20 MWcrrr2. © 1992 IOP Publishing Ltd.
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Intercalibration of the ZEUS high resolution and backing calorimeters

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment Elsevier 313:1-2 (1992) 126-134

Authors:

H Abramowicz, H Czyrkowski, A Derlicki, TZ Kowalski, M Krzyżanowski, I Kudla, W Kuśmierz, RJ Nowak, JM Pawlak, A Rajca, A Stopczyński, R Walczak, AF Żarnecki
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