Affiliation: | (1) Institute for Nuclear Research, 60th October Anniversary, Prospect 7A, 117312 Moscow, Russia;(2) Institute for Theoretical and Experimental Physics, B. Cheremushkinskaya 25, 117218 Moscow, Russia;(3) Institute for Theoretical Physics, University of Giessen, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany;(4) C.P. 13, INFN Laboratori Nazionali di Frascati, via E. Fermi 40, I-00044 Frascati, Italy |