Angular-Momentum Analysis of the Two-Particle Rearrangement Mechanism in the System of Four Spinless-Particles and zeta Particle as a Four-Pion Resonance
Angular momentum analysis of the two-particle rearrangement mechanism in the system of four spinless-particles is made. The transition amplitude due to this mechanism is derived. This provides an important driving term to generate a resonance or a bound state in the four-particle system for the case where the two-particle interactions are strongly attractive. An application is considered to the zeta particle as a four-pion resonance.