Pionic decay of a possible dibaryon d ' and quark models of pi B and pi d ' couplings

The pionic decay of a possible dibaryon, d' --> pi NN, is studied in the mo del assuming the production of P-3(0) quark-antiquark pairs and in other mo dels of effective quark-pion coupling. The vertex constants acid the form f actors for pion-baryon and pion-dibaryon couplings are calculated. The effe ct of the internal pion structure on decay widths is investigated. It is sh own that the quark structure of the nucleon-nucleon wave function in the ov erlap region plays an important role in dibaryon decays, and known models o f nucleon-nucleon interaction are analyzed with allowance for this circumst ance. The decay width of a dibaryon is estimated as a function of its effec tive mass in nuclear matter. (C) 2000 MAIK "Nauka/lnterperiodica".