Observation Of A Coherence Length Effect In Exclusive Rho(0) Electroproduction

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

PHYSICAL REVIEW LETTERS（1999）

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摘要

Exclusive incoherent electroproduction of the rho(0)(770) meson from H-1, H-2, He-3, and N-14 targets has been studied by the HERMES experiment at squared four-momentum transfer Q(2) > 0.4 GeV2 and positron energy loss nu from 9 to 20 GeV. The ratio of the N-14 to H-1 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. [S0031-9007(99)08858-4].

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