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Dijet photoproduction at HERA and the structure of the photon

European Physical Journal C 23:4 (2002) 615-631

Authors:

S Chekanov, M Derrick, D Krakauer, S Magill, B Musgrave, A Pellegrino, J Repond, R Yoshida, MCK Mattingly, P Antonioli, G Bari, M Basile, L Bellagamba, D Boscherini, A Bruni, G Bruni, G Cara Romeo, L Cifarelli, F Cindolo, A Contin, M Corradi, S de Pasquale, P Giusti, G Iacobucci, G Levi, A Margotti, T Massam, R Nania, F Palmonari, A Pesci, G Sartorelli, A Zichichi, G Aghuzumtsyan, D Bartsch, I Brock, J Crittenden, S Goers, H Hartmann, E Hilger, P Irrgang, HP Jakob, A Kappes, UF Katz, R Kerger, O Kind, E Paul, J Rautenberg, R Renner, H Schnurbusch, A Stifutkin, J Tandler, KC Voss, A Weber, H Wessoleck, DS Bailey, NH Brook, JE Cole, B Foster, GP Heath, HF Heath, S Robins, E Rodrigues, J Scott, RJ Tapper, M Wing, M Capua, A Mastroberardino, M Schioppa, G Susinno, HY Jeoung, JY Kim, JH Lee, IT Lim, KJ Ma, MY Pac, A Caldwell, M Helbich, X Liu, B Mellado, S Paganis, WB Schmidke, F Sciulli, J Chwastowski, A Eskreys, J Figiel, K Olkiewicz, MB Przybycień, P Stopa, L Zawiejski, B Bednarek, I Grabowska-Bold, K Jeleń, D Kisielewska, AM Kowal, M Kowal, T Kowalski, B Mindur, E Rulikowska-Zarȩbska, L Suszycki, D Szuba

Abstract:

The dijet cross section in photoproduction has been measured with the ZEUS detector at HERA using an integrated luminosity of 38.6 pb-1. The events were required to have a virtuality of the incoming photon, Q2, of less than 1 GeV2 and a photon-proton centre-of-mass energy in the range 134 < Wγp < 277 GeV. Each event contains at least two jets satisfying transverse-energy requirements of ETjet1 > 14 GeV and ETjet2 > 11 GeV and pseudorapidity requirements of -1 < ηjet1,2 < 2.4. The measurements are compared to next-to-leading-order QCD predictions. The data show particular sensitivity to the density of partons in the photon, allowing the validity of the current parameterisations to be tested.
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Dijet production in neutral current deep inelastic scattering at HERA

European Physical Journal C 23:1 (2002) 13-27

Authors:

S Chekanov, M Derrick, D Krakauer, S Magill, B Musgrave, A Pellegrino, J Repond, R Yoshida, MCK Mattingly, P Antonioli, G Bari, M Basile, L Bellagamba, D Boscherini, A Bruni, G Bruni, G Cara Romeo, L Cifarelli, F Cindolo, A Contin, M Corradi, S de Pasquale, P Giusti, G Iacobucci, G Levi, A Margotti, T Massam, R Nania, F Palmonari, A Pesci, G Sartorelli, A Zichichi, G Aghuzumtsyan, I Brock, S Goers, H Hartmann, E Hilger, P Irrgang, HP Jakob, A Kappes, UF Katz, R Kerger, O Kind, E Paul, J Rautenberg, H Schnurbusch, A Stifutkin, J Tandler, KC Voss, A Weber, H Wieber, DS Bailey, NH Brook, JE Cole, B Foster, GP Heath, HF Heath, S Robins, E Rodrigues, J Scott, RJ Tapper, M Wing, M Capua, A Mastroberardino, M Schioppa, G Susinno, HY Jeoung, JY Kim, JH Lee, IT Lim, KJ Ma, MY Pac, A Caldwell, M Helbich, X Liu, B Mellado, S Paganis, WB Schmidke, F Sciulli, J Chwastowski, A Eskreys, J Figiel, K Klimek, K Olkiewicz, MB Przybycień, P Stopa, L Zawiejski, B Bednarek, I Grabowska-Bold, K Jeleń, D Kisielewska, AM Kowal, M Kowal, T Kowalski, B Mindur, E Rulikowska-Zarebska, L Suszycki, D Szuba, J Szuba, A Kotanński

Abstract:

Dijet cross sections in neutral current deep inelastic ep scattering have been measured in the range 10 < Q2 < 104 GeV 2 with the ZEUS detector at HERA using an integrated luminosity of 38.4 pb-1. The cross sections, measured in the Breit frame using the kT jet algorithm, are compared with next-to-leading-order perturbative QCD calculations using proton parton distribution functions. The uncertainties of the QCD calculations have been studied. The predictions are in reasonable agreement with the measured cross sections over the entire kinematic range.
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Properties of hadronic final states in diffractive deep inelastic ep scattering at DESY HERA

Physical Review D 65:5 (2002)

Authors:

S Chekanov, M Derrick, D Krakauer, S Magill, B Musgrave, A Pellegrino, J Repond, R Yoshida, MCK Mattingly, P Antonioli, G Bari, M Basile, L Bellagamba, D Boscherini, A Bruni, G Bruni, GC Romeo, L Cifarelli, F Cindolo, A Contin, M Corradi, S De Pasquale, P Giusti, G Iacobucci, G Levi, A Margotti, T Massam, R Nania, F Palmonari, A Pesci, G Sartorelli, A Zichichi, G Aghuzumtsyan, I Brock, S Goers, H Hartmann, E Hilger, P Irrgang, HP Jakob, A Kappes, UF Katz, R Kerger, O Kind, E Paul, J Rautenberg, H Schnurbusch, A Stifutkin, J Tandler, KC Voss, A Weber, H Wieber, DS Bailey, NH Brook, JE Cole, B Foster, GP Heath, HF Heath, S Robins, E Rodrigues, J Scott, RJ Tapper, M Wing, M Capua, A Mastroberardino, M Schioppa, G Susinno, HY Jeoung, JY Kim, JH Lee, IT Lim, KJ Ma, MY Pac, A Caldwell, M Helbich, W Liu, X Liu, B Mellado, S Paganis, S Sampson, WB Schmidke, F Sciulli, J Chwastowski, A Eskreys, J Figiel, K Klimek, K Olkiewicz, MB Przybycień, P Stopa, L Zawiejski, B Bednarek, I Grabowska-Bold, K Jeleń, D Kisielewska, AM Kowal, M Kowal, T Kowalski, B Mindur, M Przybycień, E Rulikowska-Zarȩbska

Abstract:

Characteristics of the hadronic final state of diffractive deep inelastic scattering events ep→eXp were studied in the kinematic range 4
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Simulations of a hydrogen-filled capillary discharge waveguide

Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics 65:1 (2002)

Authors:

NA Bobrova, AA Esaulov, JI Sakai, PV Sasorov, DJ Spence, A Butler, SM Hooker, SV Bulanov

Abstract:

A one-dimensional dissipative magnetohydrodynamics code is used to investigate the discharge dynamics of a waveguide for high-intensity laser pulses: the gas-filled capillary discharge waveguide. Simulations are performed for the conditions of a recent experimental measurement of the electron density profile in hydrogen-filled capillaries [D. J. Spence et al., Phys. Rev. E 63, 015401 (R) (2001)], and are found to be in good agreement with those results. The evolution of the discharge in this device is found to be substantially different to that found in Z-pinch capillary discharges, owing to the fact that the plasma pressure is always much higher than the magnetic pressure. Three stages of the capillary discharge are identified. During the last of these the distribution of plasma inside the capillary is determined by the balance between ohmic heating, and cooling due to electron heat conduction. A simple analytical model of the discharge during the final stage is presented, and shown to be in good agreement with the magnetohydrodynamic simulations. © 2001 The American Physical Society.
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Exclusive photoproduction of J/ψ mesons at HERA

EUROPEAN PHYSICAL JOURNAL C 24:3 (2002) 345-360

Authors:

S Chekanov, D Krakauer, S Magill, B Musgrave, A Pellegrino, J Repond, R Yoshida, MCK Mattingly, P Antonioli, G Bari, M Basile, L Bellagamba, D Boscherini, A Bruni, G Bruni, GC Romeo, L Cifarelli, F Cindolo, A Contin, M Corradi, S De Pasquale, P Giusti, G Iacobucci, G Levi, A Margotti, T Massam, R Nania, F Palmonari, A Pesci, G Sartorelli, A Zichichi, G Aghuzumtsyan, D Bartsch, I Brock, J Crittenden, S Goers, H Hartmann, E Hilger, P Irrgang, HP Jakob, A Kappes, UF Katz, R Kerger, O Kind, E Paul, J Rautenberg, R Renner, H Schnurbusch, A Stifutkin, J Tandler, KC Voss, A Weber, H Wessoleck, DS Bailey, NH Brook, JE Cole, B Foster, GP Heath, HF Heath, S Robins, E Rodrigues, J Scott, RJ Tapper, M Wing, M Capua, A Mastroberardino, M Schioppa, G Susinno, JY Kim, YK Kim, JH Lee, IT Lim, MY Pac, A Caldwell, M Helbich, X Liu, B Mellado, S Paganis, WB Schmidke, F Sciulli, J Chwastowski, A Eskreys, J Figiel, K Olkiewicz, MB Przybycien, P Stopa, L Zawiejski, B Bednarek, I Grabowska-Bold, K Jelen, D Kisielewska, AM Kowal, M Kowal, T Kowalski, B Mindur, M Przybycien, E Rulikowska-Zarebska, L Suszycki, D Szuba, J Szuba, A Kotanski, W Slominski, LAT Bauerdick, U Behrens, K Borras, V Chiochia, D Dannheim, M Derrick, K Desler, G Drews, J Fourletova, A Fox-Murphy, U Fricke, A Geiser, F Goebel, P Göttlicher, R Graciani, T Haas, W Hain, GF Hartner, S Hillert, U Kötz, H Kowalski, H Labes, D Lelas, B Löhr, R Mankel, M Martínez, M Moritz, D Notz, MC Petrucci, A Polini, U Schneekloth, F Selonke, B Surrow, R Wichmann, G Wolf, C Youngman, W Zeuner, ALD Viani, A Meyer, S Schlenstedt, G Barbagli, E Gallo, C Genta, PG Pelfer, A Bamberger, A Benen, N Coppola, P Markun, H Raach, S Wölfle, M Bell, PJ Bussey, AT Doyle, C Glasman, S Hanlon, SW Lee, A Lupi, GJ McCance, DH Saxon, IO Skillicorn, B Bodmann, U Holm, H Salehi, K Wick, A Ziegler, A Ziegler, T Carli, I Gialas, K Klimek, E Lohrmann, M Milite, S Stonjek, C Collins-Tooth, C Foudas, R Gonçalo, KR Long, F Metlica, DB Miller, AD Tapper, R Walker, P Cloth, D Filges, M Kuze, K Nagano, K Tokushuku, S Yamada, Y Yamazaki, AN Barakbaev, EG Boos, NS Pokrovskiy, BO Zhautykov, SH Ahn, SB Lee, SK Park, H Lim, D Son, F Barreiro, G García, O González, L Labarga, J del Peso, I Redondo, J Terrón, M Vázquez, M Barbi, A Bertolin, F Corriveau, A Ochs, S Padhi, DG Stairs, M St-Laurent, T Tsurugai, A Antonov, V Bashkirov, P Danilov, BA Dolgoshein, D Gladkov, V Sosnovtsev, S Suchkov, RK Dementiev, PF Ermolov, YA Golubkov, II Katkov, LA Khein, NA Korotkova, IA Korzhavina, VA Kuzmin, BB Levchenko, OY Lukina, AS Proskuryakov, LM Shcheglova, AN Solomin, NN Vlasov, SA Zotkin, C Bokel, J Engelen, S Grijpink, E Koffeman, P Kooijman, E Maddox, S Schagen, E Tassi, H Tiecke, N Tuning, JJ Velthuis, L Wiggers, E de Wolf, N Brümmer, B Bylsma, LS Durkin, J Gilmore, CM Ginsburg, CL Kim, TY Ling, S Boogert, AM Cooper-Sarkar, RCE Devenish, J Ferrando, T Matsushita, M Rigby, O Ruske, MR Sutton, R Walczak, R Brugnera, R Carlin, F Dal Corso, S Dusini, A Garfagnini, S Limentani, A Longhin, A Parenti, M Posocco, L Stanco, M Turcato, L Adamczyk, EA Heaphy, BY Oh, PRB Saull, JJ Whitmore, Y Iga, G D'Agostini, G Marini, A Nigro, C Cormack, JC Hart, NA McCubbin, C Heusch, IH Park, N Pavel, H Abramowicz, S Dagan, A Gabareen, S Kananov, A Kreisel, A Levy, T Abe, T Fusayasu, T Kohno, K Umemori, T Yamashita, R Hamatsu, T Hirose, M Inuzuka, S Kitamura, K Matsuzawa, T Nishimura, M Arneodo, N Cartiglia, R Cirio, M Costa, MI Ferrero, S Maselli, V Monaco, C Peroni, M Ruspa, R Sacchi, A Solano, A Staiano, R Galea, T Koop, GM Levman, JF Martin, A Mirea, A Sabetfakhri, JM Butterworth, C Gwenlan, R Hall-Wilton, TW Jones, JB Lane, MS Lightwood, JH Loizides, BJ West, J Ciborowski, R Ciesielski, G Grzelak, RJ Nowak, JM Pawlak, B Smalska, J Sztuk, T Tymieniecka, A Ukleja, J Ukleja, JA Zakrzewski, AF Zarnecki, M Adamus, P Plucinski, Y Eisenberg, LK Gladilin, D Hochman, U Karshon, D Kçira, S Lammers, DD Reeder, AA Savin, WH Smith, A Deshpande, S Dhawan, VW Hughes, PB Straub, S Bhadra, CD Catterall, S Fourletov, S Menary, M Soares, J Standage
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