Measurement of the Spin Asymmetry in the Photoproduction of Pairs of High- p_T Hadrons at HERMES

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A. Airapetian³³, N. Akopov³³, M. Amarian^25,28, E. C. Aschenauer^13,14,6, H. Avakian¹⁰, R. Avakian³³, A. Avetissian³³, B. Bains¹⁵, C. Baumgarten²³, M. Beckmann¹², S. Belostotski²⁶, J. E. Belz^29,30, Th. Benisch⁸, S. Bernreuther⁸, N. Bianchi¹⁰, J. Blouw²⁵, H. Böttcher⁶, A. Borissov^6,14, J. Brack⁴, S. Brauksiepe¹², B. Braun⁸, W. Brückner¹⁴, A. Brüll¹⁴, H. J. Bulten^18,32, G. P. Capitani¹⁰, P. Carter³, P. Chumney²⁴, E. Cisbani²⁸, G. R. Court¹⁷, P. F. Dalpiaz⁹, E. De Sanctis¹⁰, D. De Schepper²⁰, E. Devitsin²², P. K. A. de Witt Huberts²⁵, P. Di Nezza¹⁰, M. Düren⁸, A. Dvoredsky³, G. Elbakian³³, J. Ely⁴, A. Fantoni¹⁰, M. Ferstl⁸, K. Fiedler⁸, B. W. Filippone³, H. Fischer¹², B. Fox⁴, J. Franz¹², S. Frullani²⁸, M.-A. Funk⁵, Y. Gärber⁶, F. Garibaldi²⁸, G. Gavrilov²⁶, P. Geiger¹⁴, V. Gharibyan³³, A. Golendukhin^19,33, G. Graw²³, O. Grebeniouk²⁶, P. W. Green^1,30, L. G. Greeniaus^1,30, C. Grosshauser⁸, M. Guidal²⁵, A. Gute⁸, W. Haeberli¹⁸, J.-O. Hansen², D. Hasch⁶, O. Häusser^{29,30 *}, F. H. Heinsius¹², R. Henderson³⁰, M. Henoch⁸, R. Hertenberger²³, Y. Holler⁵, R. J. Holt¹⁵, W. Hoprich¹⁴, H. Ihssen^5,25, M. Iodice²⁸, A. Izotov²⁶, H. E. Jackson², A. Jgoun²⁶, R. Kaiser^29,30,6, E. Kinney⁴, A. Kisselev²⁶, P. Kitching¹, H. Kobayashi³¹, N. Koch^8,19, K. Königsmann¹², M. Kolstein²⁵, H. Kolster²³, V. Korotkov⁶, W. Korsch^3,16, V. Kozlov²², L. H. Kramer¹¹, M. Kurisuno³¹, G. Kyle²⁴, W. Lachnit⁸, W. Lorenzon²¹, N. C. R. Makins^2,15, F. K. Martens¹, J. W. Martin²⁰, F. Masoli⁹, A. Mateos²⁰, M. McAndrew¹⁷, K. McIlhany³, R. D. McKeown³, F. Meissner⁶, F. M. Menden^12,30, A. Metz²³, N. Meyners⁵, O. Mikloukho²⁶, C. A. Miller^1,30, M. A. Miller¹⁵, R. Milner²⁰, A. Most²¹, V. Muccifora¹⁰, Y. Naryshkin²⁶, A. M. Nathan¹⁵, F. Neunreither⁸, M. Niczyporuk²⁰, W.-D. Nowak⁶, T. G. O'Neill², R. Openshaw³⁰, J. Ouyang³⁰, B. R. Owen¹⁵, S. F. Pate^20,24, S. Potashov²², D. H. Potterveld², G. Rakness⁴, R. Redwine²⁰, A. R. Reolon¹⁰, R. Ristinen⁴, K. Rith⁸, P. Rossi¹⁰, S. Rudnitsky²¹, M. Ruh¹², D. Ryckbosch¹³, Y. Sakemi³¹, C. Scarlett²¹, A. Schäfer²⁷, F. Schmidt⁸, H. Schmitt¹², G. Schnell²⁴, K. P. Schüler⁵, A. Schwind⁶, J. Seibert¹², T.-A. Shibata³¹, K. Shibatani³¹, T Shin²⁰, V. Shutov⁷, C. Simani⁹, A. Simon¹², K. Sinram⁵, P. Slavich^9,10, M. Spengos⁵, E. Steffens⁸, J. Stenger⁸, J. Stewart¹⁷, U. Stoesslein⁶, M. Sutter²⁰, H. Tallini¹⁷, S. Taroian³³, A. Terkulov²², B. Tipton²⁰, M. Tytgat¹³, G. M. Uriuoli²⁸, R. van de Vyver¹³, J. F. J. van den Brand^25,32, G. van der Steenhoven²⁵, J. J. van Hunen²⁵, M. C. Vetterli^29,30, V. Vikhrov²⁶, M. G. Vincter³⁰, J. Visser²⁵, E. Volk¹⁴, W. Wander⁸, J. Wendland²⁹, S. E. Williamson¹⁵, T. Wise¹⁸, K. Woller⁵, S. Yoneyama³¹, and H. Zohrabian³³ (HERMES Collaboration)
¹Department of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2J1
²Physics Division, Argonne National Laboratory, Argonne, Illinois 60439
³W. K. Kellogg Radiation Lab, California Institute of Technology, Pasadena, California 91125
⁴Nuclear Physics Laboratory, University of Colorado, Boulder, Colorado 80309-0446
⁵DESY, Deutsches Elektronen Synchrotron 22603 Hamburg, Germany
⁶DESY, 15738 Zeuthen, Germany
⁷Joint Institute for Nuclear Research, 141980 Dubna, Russia
⁸Physikalisches Institut, Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
⁹Dipartimento di Fisica, Università di Ferrara, 44100 Ferrara, Italy
¹⁰Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, 00044 Frascati, Italy
¹¹Department of Physics, Florida International University, Miami, Florida 33199
¹²Fakultät für Physik, Universität Freiburg, 79104 Freiburg, Germany
¹³Department of Subatomic and Radiation Physics, University of Gent, 9000 Gent, Belgium
¹⁴Max-Planck-Institut für Kernphysik, 69029 Heidelberg, Germany
¹⁵Department of Physics, University of Illinois, Urbana, Illinois 61801
¹⁶Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506
¹⁷Physics Department, University of Liverpool, Liverpool L69 7ZE, United Kingdom
¹⁸Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706
¹⁹Physikalisches Institut, Philipps-Universität Marburg, 35037 Marburg, Germany
²⁰Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
²¹Randall Laboratory of Physics, University of Michigan, Ann Arbor, Michigan 48109-1120
²²Lebedev Physical Institute, 117924 Moscow, Russia
²³Sektion Physik, Universität München, 85748 Garching, Germany
²⁴Department of Physics, New Mexico State University, Las Cruces, New Mexico 88003
²⁵Nationaal Instituut voor Kernfysica en Hoge-Energiefysica (NIKHEF), 1009 DB Amsterdam, The Netherlands
²⁶Petersburg Nuclear Physics Institute, St. Petersburg, 188350 Russia
²⁷Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany
²⁸Istituto Nazionale di Fisica Nucleare, Sezione Sanitá and Physics Laboratory, Istituto Superiore di Sanitá, 00161 Roma, Italy
²⁹Department of Physics, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
³⁰TRIUMF, Vancouver, British Columbia, Canada V6T 2A3
³¹Tokyo Institute of Technology, Tokyo 152, Japan
³²Department of Physics and Astronomy, Vrije Universiteit, 1081 HV Amsterdam, The Netherlands
³³Yerevan Physics Institute, 375036, Yerevan, Armenia