No abstract

No abstract

Using phenomenological methods, we analyze the decay mechanism for dibaryon resonances based on the diquark-cluster model, and discuss the possibility of observing the following states: I = O and J'= 1 + at 2.08 and 2.14 GeV c.m. energy; I = O and ~' ' 3at 2.25 GeV; and I = 1 and J P = O + at 2.02, 2.08, and 2.14 GeV. The analysis leads us to the conclusion that the decay of dibaryons can be attributed to the production of a pion followed by the transformation of the system. We describe the dynamics of the decay by the use of an effective interaction V,, which involves the operators of one-pion production and a system transformation. All the parameters in V , are determined by the use of the experimental data concerning I = 1 dibaryons. When an appropriate fine structure for the mass spectrum in the diquark-cluster model is chosen, the P I n-d phase shift ( T matrix) calculated using V,, is in close agreement with reported phase-shift-analysis data [~:(2.14)1+]. The predictions of the present model are quite consistent with the existing data both for the narrow dibaryon resonances observed in various reactions, as well as for the broad dibaryon resonances.

Based on the diquark-cluster model, the mass spectrum of low-lying S = -1 strange dibaryons is predicted. In this scheme, two J P = O states with I = + and are degenerate at the lowestenergy level, around 2.2 GeV c.m. energy. These states can be assigned to the strange-dibaryon candidate at 2.14 GeV observed by Piekarz in the missing-mass spectrum for the d ( K -, T )X reactions. A similar experiment using polarized deuterons is proposed for the purpose of testing the validity of this assignment.

No abstract