Affiliation: | 1. Institute for High Energy Physics, 142281 Protvino, Moscow region, Russia;2. Laboratoire de Physique Théorique, CNRS and Université Paris-Sud, F-91405 Orsay, France;3. Theory Unit, Department of Physics, CERN, CH-1211 Geneva 23, Switzerland;4. Deutsches Elektronensynchrotron DESY, Platanenallee 6, D-15738 Zeuthen, Germany |