APS » Phys. Rev. D » Volume 76 » Issue 7

S. Chekanov, M. Derrick, S. Magill, B. Musgrave, D. Nicholass, J. Repond, and R. Yoshida
Argonne National Laboratory, Argonne, Illinois 60439-4815, USA

M. C. K. Mattingly
Andrews University, Berrien Springs, Michigan 49104-0380, USA

M. Jechow, N. Pavel, and A. G. Yagües Molina
Institut für Physik der Humboldt-Universität zu Berlin, Berlin, Germany

S. Antonelli, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, M. Bindi, D. Boscherini, A. Bruni, G. Bruni, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, S. De Pasquale, G. Iacobucci, A. Margotti, R. Nania, A. Polini, G. Sartorelli, and A. Zichichi
University and INFN Bologna, Bologna, Italy

D. Bartsch, I. Brock, S. Goers, H. Hartmann, E. Hilger, H.-P. Jakob, M. Jüngst, O. M. Kind, A. E. Nuncio-Quiroz, E. Paul, R. Renner, U. Samson, V. Schönberg, R. Shehzadi, and M. Wlasenko
Physikalisches Institut der Universität Bonn, Bonn, Germany

N. H. Brook, G. P. Heath, and J. D. Morris
H. H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom

M. Capua, S. Fazio, A. Mastroberardino, M. Schioppa, G. Susinno, and E. Tassi
Calabria University, Physics Department and INFN, Cosenza, Italy

J. Y. Kim and K. J. Ma
Chonnam National University, Kwangju, South Korea

Z. A. Ibrahim, B. Kamaluddin, and W. A. T. Wan Abdullah
Jabatan Fizik, Universiti Malaya, 50603 Kuala Lumpur, Malaysia

Y. Ning, Z. Ren, and F. Sciulli
Nevis Laboratories, Columbia University, Irvington on Hudson, New York 10027, USA

J. Chwastowski, A. Eskreys, J. Figiel, A. Galas, M. Gil, K. Olkiewicz, P. Stopa, and L. Zawiejski
The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Cracow, Poland

L. Adamczyk, T. Bold, I. Grabowska-Bold, D. Kisielewska, J. Lukasik, M. Przybycień, and L. Suszycki
Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Cracow, Poland

A. Kotański and W. Slomiński
Department of Physics, Jagellonian University, Cracow, Poland

V. Adler, U. Behrens, I. Bloch, C. Blohm, A. Bonato, K. Borras, R. Ciesielski, N. Coppola, A. Dossanov, V. Drugakov, J. Fourletova, A. Geiser, D. Gladkov, P. Göttlicher, J. Grebenyuk, I. Gregor, T. Haas, W. Hain, C. Horn, A. Hüttmann, B. Kahle, I. I. Katkov, U. Klein, U. Kötz, H. Kowalski, E. Lobodzinska, B. Löhr, R. Mankel, I.-A. Melzer-Pellmann, S. Miglioranzi, A. Montanari, T. Namsoo, D. Notz, L. Rinaldi, P. Roloff, I. Rubinsky, R. Santamarta, U. Schneekloth, A. Spiridonov, H. Stadie, D. Szuba, J. Szuba, T. Theedt, G. Wolf, K. Wrona, C. Youngman, and W. Zeuner
Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany

W. Lohmann and S. Schlenstedt
Deutsches Elektronen-Synchrotron DESY, Zeuthen, Germany

G. Barbagli, E. Gallo, and P. G. Pelfer
University and INFN, Florence, Italy

A. Bamberger, D. Dobur, F. Karstens, and N. N. Vlasov
Fakultät für Physik der Universität Freiburg i.Br., Freiburg i.Br., Germany

P. J. Bussey, A. T. Doyle, W. Dunne, J. Ferrando, M. Forrest, D. H. Saxon, and I. O. Skillicorn
Department of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom

I. Gialas and K. Papageorgiu
Department of Engineering in Management and Finance, University of Aegean, Greece

T. Gosau, U. Holm, R. Klanner, E. Lohrmann, H. Perrey, H. Salehi, P. Schleper, T. Schörner-Sadenius, J. Sztuk, K. Wichmann, and K. Wick
Hamburg University, Institute of Exp. Physics, Hamburg, Germany

C. Foudas, C. Fry, K. R. Long, and A. D. Tapper
Imperial College London, High Energy Nuclear Physics Group, London, United Kingdom

M. Kataoka, T. Matsumoto, K. Nagano, K. Tokushuku, S. Yamada, and Y. Yamazaki
Institute of Particle and Nuclear Studies, KEK, Tsukuba, Japan

A. N. Barakbaev, E. G. Boos, N. S. Pokrovskiy, and B. O. Zhautykov
Institute of Physics and Technology of Ministry of Education and Science of Kazakhstan, Almaty, Kazakhstan

V. Aushev
Institute for Nuclear Research, National Academy of Sciences, Kiev and Kiev National University, Kiev, Ukraine

D. Son
Kyungpook National University, Center for High Energy Physics, Daegu, South Korea

J. de Favereau and K. Piotrzkowski
Institut de Physique Nucléaire, Université Catholique de Louvain, Louvain-la-Neuve, Belgium

F. Barreiro, C. Glasman, M. Jimenez, L. Labarga, J. del Peso, E. Ron, M. Soares, J. Terrón, and M. Zambrana
Departamento de Física Teórica, Universidad Autónoma de Madrid, Madrid, Spain

F. Corriveau, C. Liu, R. Walsh, and C. Zhou
Department of Physics, McGill University, Montréal, Québec, Canada H3A 2T8

T. Tsurugai
Meiji Gakuin University, Faculty of General Education, Yokohama, Japan

A. Antonov, B. A. Dolgoshein, V. Sosnovtsev, A. Stifutkin, and S. Suchkov
Moscow Engineering Physics Institute, Moscow, Russia

R. K. Dementiev, P. F. Ermolov, L. K. Gladilin, L. A. Khein, I. A. Korzhavina, V. A. Kuzmin, B. B. Levchenko, O. Yu. Lukina, A. S. Proskuryakov, L. M. Shcheglova, D. S. Zotkin, and S. A. Zotkin
Moscow State University, Institute of Nuclear Physics, Moscow, Russia

I. Abt, C. Büttner, A. Caldwell, D. Kollar, W. B. Schmidke, and J. Sutiak
Max-Planck-Institut für Physik, München, Germany

G. Grigorescu, A. Keramidas, E. Koffeman, P. Kooijman, A. Pellegrino, H. Tiecke, M. Vázquez, and L. Wiggers
NIKHEF and University of Amsterdam, Amsterdam, The Netherlands

N. Brümmer, B. Bylsma, L. S. Durkin, A. Lee, and T. Y. Ling
Physics Department, Ohio State University, Columbus, Ohio 43210, USA

P. D. Allfrey, M. A. Bell, A. M. Cooper-Sarkar, A. Cottrell, R. C. E. Devenish, B. Foster, K. Korcsak-Gorzo, S. Patel, V. Roberfroid, A. Robertson, P. B. Straub, C. Uribe-Estrada, and R. Walczak
Department of Physics, University of Oxford, Oxford, United Kingdom

P. Bellan, A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, S. Dusini, A. Garfagnini, S. Limentani, A. Longhin, L. Stanco, and M. Turcato
Dipartimento di Fisica dell' Università and INFN, Padova, Italy

B. Y. Oh, A. Raval, J. Ukleja, and J. J. Whitmore
Department of Physics, Pennsylvania State University, University Park, Pennsylvania, 16802, USA

Y. Iga
Polytechnic University, Sagamihara, Japan

G. D'Agostini, G. Marini, and A. Nigro
Dipartimento di Fisica, Università 'La Sapienza' and INFN, Rome, Italy

J. E. Cole and J. C. Hart
Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, United Kingdom

H. Abramowicz, A. Gabareen, R. Ingbir, S. Kananov, and A. Levy
Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel-Aviv University, Tel-Aviv, Israel

M. Kuze and J. Maeda
Department of Physics,Tokyo Institute of Technology, Tokyo, Japan

R. Hori, S. Kagawa, N. Okazaki, S. Shimizu, and T. Tawara
Department of Physics, University of Tokyo, Tokyo, Japan

R. Hamatsu, H. Kaji, S. Kitamura, O. Ota, and Y. D. Ri
Tokyo Metropolitan University, Department of Physics, Tokyo, Japan

M. I. Ferrero, V. Monaco, R. Sacchi, and A. Solano
Università di Torino and INFN, Torino, Italy

M. Arneodo and M. Ruspa
Università del Piemonte Orientale, Novara, and INFN, Torino, Italy

S. Fourletov and J. F. Martin
Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7

S. K. Boutle, J. M. Butterworth, C. Gwenlan, T. W. Jones, J. H. Loizides, M. R. Sutton, C. Targett-Adams, and M. Wing
Physics and Astronomy Department, University College London, London, United Kingdom

B. Brzozowska, J. Ciborowski, G. Grzelak, P. Kulinski, P. Luzniak, J. Malka, R. J. Nowak, J. M. Pawlak, T. Tymieniecka, J. Ukleja, and A. F. Żarnecki
Warsaw University, Institute of Experimental Physics, Warsaw, Poland

M. Adamus and P. Plucinski
Institute for Nuclear Studies, Warsaw, Poland

Y. Eisenberg, I. Giller, D. Hochman, U. Karshon, and M. Rosin
Department of Particle Physics, Weizmann Institute, Rehovot, Israel

E. Brownson, T. Danielson, A. Everett, D. Kçira, D. D. Reeder, P. Ryan, A. A. Savin, W. H. Smith, and H. Wolfe
Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA

S. Bhadra, C. D. Catterall, Y. Cui, G. Hartner, S. Menary, U. Noor, J. Standage, and J. Whyte
Department of Physics, York University, Ontario, Canada M3J 1P3

(ZEUS Collaboration)

The cross section for high-E_T dijet production in photoproduction has been measured with the ZEUS detector at HERA using an integrated luminosity of 81.8 pb^-1. The events were required to have a virtuality of the incoming photon, Q², of less than 1 GeV² and a photon-proton center-of-mass energy in the range 142<W_gammap<293 GeV. Events were selected if at least two jets satisfied the transverse-energy requirements of E_T^jet1>20 GeV and E_T^jet2>15 GeV and pseudorapidity (with respect to the proton beam direction) requirements of -1<eta^jet1,2<3, with at least one of the jets satisfying -1<eta^jet<2.5. The measurements show sensitivity to the parton distributions in the photon and proton and to effects beyond next-to-leading order in QCD. Hence these data can be used to constrain further the parton densities in the proton and photon.

©2007 The American Physical Society

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