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Observation of a Coherence Length Effect in Exclusive ρ 0 Electroproduction

1999; American Physical Society; Volume: 82; Issue: 15 Linguagem: Inglês

10.1103/physrevlett.82.3025

1092-0145

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

Quantum Chromodynamics and Particle Interactions

Exclusive incoherent electroproduction of the rho^0(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 nu 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.