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High-ET dijet photoproduction at HERA

S. Chekanov, M. Derrick, S. Magill, B. Musgrave, D. Nicholassa, J. Repond, and R. Yoshida

M. C. K. Mattingly

M. Jechow, N. Pavelv, and A. G. Yagües Molina

S. Antonelli, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, M. Bindi, D. Boscherini, A. Bruni, G. Bruni et al.

D. Bartsch, I. Brock, S. Goersb, H. Hartmann, E. Hilger, H.-P. Jakob, M. Jüngst, O. M. Kindc, A. E. Nuncio-Quiroz et al.

N. H. Brook, G. P. Heath, and J. D. Morris

M. Capua, S. Fazio, A. Mastroberardino, M. Schioppa, G. Susinno, and E. Tassi

J. Y. Kim and K. J. Ma

Z. A. Ibrahim, B. Kamaluddin, and W. A. T. Wan Abdullah

Y. Ning, Z. Ren, and F. Sciulli

J. Chwastowski, A. Eskreys, J. Figiel, A. Galas, M. Gil, K. Olkiewicz, P. Stopa, and L. Zawiejski

L. Adamczyk, T. Bołd, I. Grabowska-Bołd, D. Kisielewska, J. Łukasik, M. Przybycień, and L. Suszycki

A. Kotański and W. Słomiński

V. Adlerf, U. Behrens, I. Bloch, C. Blohm, A. Bonato, K. Borras, R. Ciesielski, N. Coppola, A. Dossanov et al.

W. Lohmann and S. Schlenstedt

G. Barbagli, E. Gallo, and P. G. Pelfer

A. Bamberger, D. Dobur, F. Karstens, and N. N. Vlasov

P. J. Bussey, A. T. Doyle, W. Dunne, J. Ferrando, M. Forrest, D. H. Saxon, and I. O. Skillicorn

I. Gialasm and K. Papageorgiu

T. Gosau, U. Holm, R. Klanner, E. Lohrmann, H. Perrey, H. Salehi, P. Schleper, T. Schörner-Sadenius, J. Sztuk et al.

C. Foudas, C. Fry, K. R. Long, and A. D. Tapper

M. Kataokan, T. Matsumoto, K. Nagano, K. Tokushukuo, S. Yamada, and Y. Yamazaki

A. N. Barakbaev, E. G. Boos, N. S. Pokrovskiy, and B. O. Zhautykov

V. Ausheva

D. Son

J. de Favereau and K. Piotrzkowski

F. Barreiro, C. Glasman, M. Jimenez, L. Labarga, J. del Peso, E. Ron, M. Soares, J. Terrón, and M. Zambrana

F. Corriveau, C. Liu, R. Walsh, and C. Zhou

T. Tsurugai

A. Antonov, B. A. Dolgoshein, V. Sosnovtsev, A. Stifutkin, and S. Suchkov

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 et al.

I. Abt, C. Büttner, A. Caldwell, D. Kollar, W. B. Schmidke, and J. Sutiak

G. Grigorescu, A. Keramidas, E. Koffeman, P. Kooijman, A. Pellegrino, H. Tiecke, M. Vázquez, and L. Wiggers

N. Brümmer, B. Bylsma, L. S. Durkin, A. Lee, and T. Y. Ling

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 et al.

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Y. Iga

G. D’Agostini, G. Marini, and A. Nigro

J. E. Cole and J. C. Hart

H. Abramowiczp, A. Gabareen, R. Ingbir, S. Kananov, and A. Levy

M. Kuze and J. Maeda

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S. Bhadra, C. D. Catterall, Y. Cui, G. Hartner, S. Menary, U. Noor, J. Standage, and J. Whyte

  • Argonne National Laboratory, Argonne, Illinois 60439-4815, USA

  • Andrews University, Berrien Springs, Michigan 49104-0380, USA

  • Institut für Physik der Humboldt-Universität zu Berlin, Berlin, Germany

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

E. Pauld, R. Rennere, U. Samson, V. Schönberg, R. Shehzadi, and M. Wlasenko

  • Physikalisches Institut der Universität Bonn, Bonn, Germany

  • H. H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom

  • Calabria University, Physics Department and INFN, Cosenza, Italy

  • Chonnam National University, Kwangju, South Korea

  • Jabatan Fizik, Universiti Malaya, 50603 Kuala Lumpur, Malaysia

  • Nevis Laboratories, Columbia University, Irvington on Hudson, New York 10027, USAw

  • The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Cracow, Poland

  • Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Cracow, Poland

  • Department of Physics, Jagellonian University, Cracow, Poland

V. Drugakov, J. Fourletova, A. Geiser, D. Gladkov, P. Göttlicherg, J. Grebenyuk, I. Gregor, T. Haas, W. Hain, C. Hornh, A. Hüttmann, B. Kahle, I. I. Katkov, U. Kleini, 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. Spiridonovj, H. Stadie, D. Szubak, J. Szubal, T. Theedt, G. Wolf, K. Wrona, C. Youngman, and W. Zeuner

  • Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany

  • Deutsches Elektronen-Synchrotron DESY, Zeuthen, Germany

  • University and INFN, Florence, Italy

  • Fakultät für Physik der Universität Freiburg i.Br., Freiburg i.Br., Germany

  • Department of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom

  • Department of Engineering in Management and Finance, University of Aegean, Greece

K. Wichmann and K. Wick

  • Hamburg University, Institute of Exp. Physics, Hamburg, Germany

  • Imperial College London, High Energy Nuclear Physics Group, London, United Kingdom

  • Institute of Particle and Nuclear Studies, KEK, Tsukuba, Japan

  • Institute of Physics and Technology of Ministry of Education and Science of Kazakhstan, Almaty, Kazakhstan

  • Institute for Nuclear Research, National Academy of Sciences, Kiev and Kiev National University, Kiev, Ukraine

  • Kyungpook National University, Center for High Energy Physics, Daegu, South Korea

  • Institut de Physique Nucléaire, Université Catholique de Louvain, Louvain-la-Neuve, Belgium

  • Departamento de Física Teórica, Universidad Autónoma de Madrid, Madrid, Spain

  • Department of Physics, McGill University, Montréal, Québec, Canada H3A 2T8

  • Meiji Gakuin University, Faculty of General Education, Yokohama, Japan

  • Moscow Engineering Physics Institute, Moscow, Russia

L. M. Shcheglova, D. S. Zotkin, and S. A. Zotkin

  • Moscow State University, Institute of Nuclear Physics, Moscow, Russia

  • Max-Planck-Institut für Physik, München, Germany

  • NIKHEF and University of Amsterdam, Amsterdam, The Netherlands

  • Physics Department, Ohio State University, Columbus, Ohio 43210, USA

A. Robertson, P. B. Straub, C. Uribe-Estrada, and R. Walczak

  • Department of Physics, University of Oxford, Oxford, United Kingdom

L. Stanco and M. Turcato

  • Dipartimento di Fisica dell’ Università and INFN, Padova, Italy

  • Department of Physics, Pennsylvania State University, University Park, Pennsylvania, 16802, USA

  • Polytechnic University, Sagamihara, Japan

  • Dipartimento di Fisica, Università ’La Sapienza’ and INFN, Rome, Italy

  • Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, United Kingdom

  • Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel-Aviv University, Tel-Aviv, Israel

  • Department of Physics,Tokyo Institute of Technology, Tokyo, Japan

  • Department of Physics, University of Tokyo, Tokyo, Japan

  • Tokyo Metropolitan University, Department of Physics, Tokyo, Japan

  • Università di Torino and INFN, Torino, Italy

  • Università del Piemonte Orientale, Novara, and INFN, Torino, Italy

  • Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7

  • Physics and Astronomy Department, University College London, London, United Kingdom

J. Ukleja and A. F. Żarnecki

  • Warsaw University, Institute of Experimental Physics, Warsaw, Poland

  • Institute for Nuclear Studies, Warsaw, Poland

  • Department of Particle Physics, Weizmann Institute, Rehovot, Israel

  • Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA

  • Department of Physics, York University, Ontario, Canada M3J 1P3

  • aAlso affiliated with University College London, United Kingdom.
  • bNow with TÜV Nord, Germany.
  • cNow at Humboldt University, Berlin, Germany.
  • dRetired.
  • eSelf-employed.
  • fNow at Univ. Libre de Bruxelles, Belgium.
  • gNow at DESY group FEB, Hamburg, Germany.
  • hNow at Stanford Linear Accelerator Center, Stanford, USA.
  • iNow at University of Liverpool, United Kingdom.
  • jAlso at Institut of Theoretical and Experimental Physics, Moscow, Russia.
  • kAlso at INP, Cracow, Poland.
  • lOn leave of absence from FPACS, AGH-UST, Cracow, Poland.
  • mAlso affiliated with DESY.
  • nNow at CERN, Geneva, Switzerland.
  • oAlso at University of Tokyo, Japan.
  • pAlso at Max Planck Institute, Munich, Germany, Alexander von Humboldt Research Award.
  • qNow at KEK, Tsukuba, Japan.
  • rNow at Nagoya University, Japan.
  • sDepartment of Radiological Science.
  • tAlso at Łódź University, Poland.
  • uŁódź University, Poland.
  • vDeceased.
  • wAny opinion, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.
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Phys. Rev. D 76, 072011 – Published 29 October, 2007

DOI: https://doi.org/10.1103/PhysRevD.76.072011

Abstract

The cross section for high-ET 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<Wγp<293  GeV. Events were selected if at least two jets satisfied the transverse-energy requirements of ETjet1>20  GeV and ETjet2>15  GeV and pseudorapidity (with respect to the proton beam direction) requirements of −1<ηjet1,2<3, with at least one of the jets satisfying −1<ηjet<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.

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Phys. Rev. D 76, 072011– Published 29 October, 2007
  • Received 2 July 2007

© 2007 American Physical Society

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