Observation of a coherence length effect in exclusive ρ(0) electroproduction

Creators: Ackerstaff, K.; Airapetian, A.; Akopov, N.; Akushevich, I.; Amarian, M.; Aschenauer, E. C.; Avakian, H.; Avakian, R.; Avetissian, A.; Bains, B.; Barrow, S.; Baumgarten, C.; Beckmann, M.; Belostotski, St.; Belz, J. E.; Benisch, Th.; Bernreuther, S.; Bianchi, N.; Blanchard, S.; Blouw, J.; Böttcher, H.; Borissov, A.; Brack, J.; Brauksiepe, S.; Braun, B.; Bray, B.; Brons, St.; Brückner, W.; Brüll, A.; Bruins, E. E. W.; Bulten, H. J.; Cadman, R. V.; Capitani, G. P.; Carter, P.; Chumney, P.; Cisbani, E.; Court, G. R.; Dalpiaz, P. F.; Delheij, P. P. J.; De Sanctis, E.; De Schepper, D.; Devitsin, E.; de Witt Huberts, P. K. A.; Di Nezza, P.; Düren, M.; Dvoredsky, A.; Elbakian, G.; Ely, J.; Emerson, J.; Fantoni, A.; Fechtchenko, A.; Ferstl, M.; Fick, D.; Fiedler, K.; Filippone, B. W.; Fischer, H.; Fortune, H. T.; Fox, B.; Frabetti, S.; Franz, J.; Frullani, S.; Funk, M.-A.; Gagunashvili, N. D.; Galumian, P.; Gao, H.; Gärber, Y.; Garibaldi, F.; Gavrilov, G.; Geiger, P.; Gharibyan, V.; Giordjian, V.; Golendukhin, A.; Graw, G.; Grebeniouk, O.; Green, P. W.; Greeniaus, L. G.; Grosshauser, C.; Guidal, M. G.; Gute, A.; Gyurjyan, V.; Haas, J. P.; Haeberli, W.; Hansen, J.-O.; Hasch, D.; Häusser, O.; Heinsius, F. H.; Henderson, R. S.; Henkes, Th.; Henoch, M.; Hertenberger, R.; Holler, Y.; Holt, R. J.; Hoprich, W.; Ihssen, H.; Iodice, M.; Izotov, A.; Jackson, H. E.; Jgoun, A.; Jones, C.; Kaiser, R.; Kinney, E.; Kirsch, M.; Kisselev, A.; Kitching, P.; Kobayashi, H.; Koch, N.; Königsmann, K.; Kolstein, M.; Kolster, H.; Korotkov, V.; Korsch, W.; Kozlov, V.; Kramer, L. H.; Krause, B.; Krivokhijine, V. G.; Kückes, M.; Kümmell, F.; Kyle, G.; Lachnit, W.; Lorenzon, W.; Lung, A.; Makins, N. C. R.; Martens, F. K.; Martin, J. W.; Masoli, F.; Mateos, A.; McAndrew, M.; McIlhany, K.; McKeown, R. D.; Meissner, F.; Menden, F.; Mercer, D.; Metz, A.; Meyners, N.; Mikloukho, O.; Miller, C. A.; Miller, M. A.; Milner, R. G.; Mitsyn, V.; Most, A.; Mozzetti, R.; Muccifora, V.; Nagaitsev, A.; Naryshkin, Y.; Nathan, A. M.; Neunreither, F.; Niczyporuk, M.; Nowak, W.-D.; Nupieri, M.; Oelwein, P.; Ogami, H.; O'Neill, T. G.; Openshaw, R.; Ouyang, J.; Owen, B. R.; Papavassiliou, V.; Pate, S. F.; Pitt, M.; Poolman, H. R.; Potashov, S.; Potterveld, D. H.; Povh, B.; Rakness, G.; Reali, A.; Redwine, R.; Reolon, A. R.; Ristinen, R.; Rith, K.; Roloff, H.; Röper, G.; Rossi, P.; Rudnitsky, S.; Ruh, M.; Ryckbosch, D.; Sakemi, Y.; Savin, I.; Scarlett, C.; Schmidt, F.; Schmitt, H.; Schnell, G.; Schüler, K. P.; Schwind, A.; Seibert, J.; Shibata, T.-A.; Shin, T.; Shutov, V.; Simani, C.; Simon, A.; Sinram, K.; Slavich, P.; Sowinski, J.; Spengos, M.; Steffens, E.; Stenger, J.; Stewart, J.; Stock, F.; Stoesslein, U.; Sutter, M.; Tallini, H.; Taroian, S.; Terkulov, A.; Thiessen, D. M.; Thomas, E.; Tipton, B.; Trudel, A.; Tytgat, M.; Urciuoli, G. M.; van Hunen, J. J.; van de Vyver, R.; van den Brand, J. F. J.; van der Steenhoven, G.; Vetterli, M. C.; Vikhrov, V.; Vincter, M.; Visser, J.; Volk, E.; Wander, W.; Welch, T. P.; Williamson, S. E.; Wise, T.; Wölfel, T.; Woller, K.; Yoneyama, S.; Zapfe-Düren, K.; Zohrabian, H.; Zurmühle, R.; HERMES Collaboration

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Abstract

Exclusive incoherent electroproduction of the ρ0(770) meson from 1H, 2H, 3He, and 14N targets has been studied by the HERMES experiment at squared four-momentum transfer Q^2>0.4 GeV^2 and positron energy loss ν from 9 to 20 GeV. The ratio of the 14N to 1H cross sections per nucleon, known as the nuclear transparency, was found to decrease with increasing coherence length of quark-antiquark fluctuations of the virtual photon. The data provide clear evidence of the interaction of the quark-antiquark fluctuations with the nuclear medium.

Additional Information

© 1999 American Physical Society. Received 5 November 1998. We gratefully acknowledge the DESY management for its support and the DESY staff and the staffs of the collaborating institutions. We also thank B. Z. Kopeliovich, J. Nemchik, M. Strikman, and especially D. F. Geesaman for helpful discussions. This work was supported by the FWO-Flanders, Belgium; the Natural Sciences and Engineering Research Council of Canada; the INTAS and TMR network contributions from the European Community; the German Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie; the Deutscher Akademischer Austauschdienst (DAAD); the Italian Istituto Nazionale di Fisica Nucleare (INFN); Monbusho, JSPS, and Toray Science Foundation of Japan; the Dutch Foundation for Fundamental Onderzoek der Materie (FOM); the U.K. Particle Physics and Astronomy Research Council; and the U.S. Department of Energy and National Science Foundation.

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