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Physics Letters B
Volume 297, Issues 3-4, 31 December 1992, Pages 404-416
 
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doi:10.1016/0370-2693(92)91280-M    How to Cite or Link Using DOI (Opens New Window)
Copyright © 1992 Published by Elsevier Science B.V. All rights reserved.

Observation of hard scattering in photoproduction at HERA

ZEUS Collaboration, M. Derrick, D. Krakauer, S. Magill, B. Musgrave, J. Repond, K. Sugano1, R. Stanek, R. L. Talaga and J. Thron

F. Arzarello, R. Ayed2, G. Barbagli3, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini4, 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 Garcia2 and A. Zichichi

A. Bargende, F. Barreiro5, J. Crittenden, H. Dabbous, K. Desch, B. Diekmann, M. Geerts, G. Geitz, B. Gutjahr, H. Hartmann, J. Hartmann, D. Haun, K. Heinloth, E. Hilger, H. -P. Jakob, S. Kramarczyk, M. Kückes, A. Mass, S. Mengel, J. Mollen, H. Müsch, E. Paul, R. Schattevoy, B. Schneider6, J. -L. Schneider and R. Wedemeyer

A. Cassidy, D. G. Cussans, N. Dyce, H. F. Fawcett, B. Foster, R. Gilmore, G. P. Heath, M. Lancaster, T. J. Llewellyn, J. Malos, C. J. S. Morgado, R. J. Tapper and S. S. Wilson

R. R. Rau

A. Bernstein, A. Caldwell, I. Gialas, J. A. Parsons, S. Ritz, F. Sciulli7, P. B. Straub, L. Wai and S. Yang

T. Barillari, M. Schioppa and G. Susinno

W. Burkot, J. Chwastowski8, A. DwuraImage ny, A. Eskreys, B. NizioImage , Z. Jakubowski9, K.Piotrzkowski, M. Zachara and L. Zawiejski

P. Borzemski, K. Eskreys, K. JeleImage , D. Kisielewska, T. Kowalski, J. Kulka, E. Rulikowska-ZarImage bska, L. Suszycki and J. ZajImage c

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L. A. T. Bauerdick, U. Behrens, J. K. Bienlein, C. Coldewey, A. Dannemann, K. Dierks10, W. Dorth10, G. Drews, P. Erhard11, M. FlasiImage ski12, I. Fleck, A. Fürtjes, R. Gläser13, P. Göttlicher, T. Haas, L. Hagge, W. Hain, D. Hasell, H. Hultschig, G. Jahnen14, P. Joos, M. Kasemann, R. Klanner, W. Koch, U. Kötz, H. Kowalski, J. Labs, A. Ladage, B. Löhr, M. Löwe, D. Lüke, J. Mainusch, O. Manczak15, M. Momayezi, S. Nickel, D. Notz, I. Park, K. -U. Pösnecker16, M. Rohde, E. Ros8, U. Schneekloth, J. Schroeder, W. Schulz, F. Selonke, E. Tscheslog17, T. Tsurugai, F. Turkot18, W. Vogel19, T. Woeniger20, G. Wolf and C. Youngman

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W. R. Frisken, K. M. Furutani and Y. Iga

Argonne National Laboratory, Argonne, IL 60439, USA University of Bologna and INFN Bologna, I-40126, Bologna, Italy Physikalisches Institut der Universität Bonn, W-5300, Bonn 1, FRG Bristol University, Bristol BS8 1TL, UK Brookhaven National Laboratory, Upton, NY 11973, USA Nevis Laboratories, Columbia University, Irvington on Hudson, NY 10533, USA Physics Department, Calabria University, and INFN, I-87036, Cosenza, Italy Institute of Nuclear Physics, Cracow, Poland Institute of Physics and Nuclear Techniques, Academy of Mining and Metallurgy, Cracow, Poland Department of Physics, Jagellonian University, PL-30 059, Cracow, Poland Deutsches Elektronen-Synchrotron DESY, W-2000, Hamburg 52, FRG Institut für Hochenergiephysik, DESY-Zeuthen, O-1615, Zeuthen, FRG University of Florence and INFN, I-50125, Florence, Italy INFN, Laboratori Nazionali di Frascati, I-00044, Frascati, Italy Physikalisches Institut der Universität Freiburg, W-7800, Freiburg, FRG Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, UK I. Institute of Experimental Physics, Hamburg University, W-2000, Hamburg, FRG II. Institute of Experimental Physics, Hamburg University, W-2000, Hamburg 50, FRG High Energy Nuclear Physics Group, Imperial College London, London SW7 2BZ, UK Physics and Astronomy Department, University of Iowa, Iowa City, IA 52240, USA Institut für Kernphysik, Forschungszentrum Jülich, W-5170, Jülich 1, FRG Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA Departamento de Física Teórica, Universidad Autónoma de Madrid, E-28049, Madrid, Spain Department of Physics, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2 Department of Physics, McGill University, Montreal, Quebec, Canada H3A 2T8 Institute of Nuclear Physics, Moscow State University, 117 234, Moscow, Russian Federation NIKHEF, NL-1009 DB, Amsterdam, The Netherlands Physics Department, Ohio State University, Columbus, OH 43210, USA Department of Physics, University of Oxford, Oxford, UK Dipartimento di Fisica dell'Università and INFN, I-35131, Padua, Italy Department of Physics, Pennsylvania State University, University Park, PA 16802, USA Dipartimento di Fisica, Università “La Sapienza”, I-00185, Rome, Italy Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, UK University of California, Santa Cruz, CA 95064, USA Fachbereich Physik der Universität-Gesamthochschule Siegen, W-5900, Siegen 21, FRG School of Physics, Tel-Aviv University, Tel Aviv 69978, Israel Institute for Nuclear Study, University of Tokyo, Tokyo 188, Japan Department of Physics, Tokyo Metropolitan University, Tokyo 158, Japan Dipartimento di Fisica Sperimentale, Università di Torino, and INFN, I-10125, Turin, Italy Facultá di Scienze MFN, Università di Torino, Alessandria, Italy Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7 Physics and Astronomy Department, University College London, London WC1E 6BT, UK Physics Department, Virginia Polytechnic Institute, Blacksburg, VA 24061, USA Institute of Experimental Physics, Warsaw University, PL-00 681, Warsaw, Poland Institute for Nuclear Studies, Warsaw, Poland Nuclear Physics Department, Weizmann Institute, Rehovot 76100, Israel Department of Physics, University of Wisconsin, Madison, WI 53706, USA Department of Physics, York University, North York, Ontario, Canada

Received 19 October 1992. 
Available online 18 October 2002.

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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.

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Physics Letters B
Volume 297, Issues 3-4, 31 December 1992, Pages 404-416
 
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