Field-theory approach to the dibaryon model of nuclear forces

A covariant fieid-theory formulation of the recently developed dibaryon model of nuclear forces is given. The model involves an intermediate dibaryon dressed with pi, or, p, and other fields; the corresponding mesons can be in various orbitally excited states with respect to a six-quark bag; and scalar, pseudoscalar, vector, and axial-vector fields are taken into account for the dressed dibaryon. Particular attention is given to nucleon-nucleon interaction in even partial waves. A relativistically covariant nucleon-nucleon potential is derived. It is shown that a simple generalization of the single-channel model makes it possible to take into account coupling to other baryon channels of the NDelta, DeltaDelta, NN*(1535), etc., types, this in turn leading to a description of the production of various mesons within this approach. The model also enables one to describe, in a natural way, 2pi production in nucleon-nucleon collisions in the isoscalar and in the isovector channel and provides a new formulation of the theory of meson-exchange currents in the physics of electromagnetic interactions. The possible applications of the developed approach in the physics of hadron interactions and in nuclear physics on the whole are discussed. (C) 2004 MAIK "Nauka/Interperiodica".