PHENOMENOLOGICAL QUARK-MODEL FOR STRONG DECAYS

A Lorentz covariant form of the pair creation model for strong decays is presented as part of a general approach for strong interaction in the soft limit. It is assumed that strong interaction among hadrons occurs by means of the spontaneous emission and absorbtion of vacuum-like quark antiquark pairs which modify the initial distribution of the valence quarks in free hadrons. The effect of these quantum fluctuations is formally described by the action of the Moeller operators U(+ infinity, 0) and U(0, - infinity) which are assumed to act independently on each valence quark. The amplitudes of the strong decays are expressed in terms of the internal distribution of momenta in free hadrons and of some universal functions omega(+/-) describing the action of the Moeller operators on the valence quarks.