Affiliation: | a Inter-University Institute for High Energies, ULB-VUB, B-1050, Brussels, Belgium b Institute of Nuclear Physics, PL-30055, Cracow, Poland c Dipartimento di Fisica dell'Università e Sezione INFN, I-70126, Bari, Italy d Institute of High Energy Physics, Serpukhov, SU-142 284, Protvino (Moscow region), USSR e Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, UK f University of Birmingham, Birmingham B15 2TT, UK g CERN, CH-1211, Geneva 23, Switzerland h DPhPE, Centre d'Etudes Nucléaires, Saclay, F-91191, Gif-sur-Yvette, France i Max-Planck-Institut für Physik und Astrophysik, W-8000, Munich 40, FRG j NIKHEF-H, NL-1098 SJ, Amsterdam, The Netherlands |