Affiliation: | 1. Ames Laboratory and Physics Department, Iowa State University, 50011, Ames, IA, USA 3. Dipartimento di Fisica dell'Università and INFN, I-40126, Bologna, Italy 4. European Organization for Nuclear Research, CERN, CH-1211, Geneva 23, Switzerland 5. University and Institute of Nuclear Studies, Warsaw, Poland 6. Institut für Hochenergiephysik der Universit?t, D-6900, Heidelberg, Federal Republic of Germany 11. Institut für Physik der Universit?t, D-4600, Dortmund, Federal Republic of Germany
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