Nonleptonic Hyperon Decays in the Constituent Rearrangement Model and Universality of d/f Ratios

Nonleptonic decays of hyperons are investigated in terms of the constituent rearrangement (CR) model by assuming i) dominance of 15 and 20″ components of the weak Hamiltonian SU(4), ii) universality of d/f ratios and iii) spin non-flip along spectator constituent lines. We analyze the CP invariant CR amplitudes and obtain Σ++ = 0 as well as the Lee-Sugawara relation for s-wave decays. It is shown that the contribution of 15 is much larger than that of 20″ in the s-wave decays, while the 20″ component is important for describing the p-wave amplitudes.