Analysis of the decay mechanism of dibaryon resonances.

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 = 0 and J/sup P/ = 1/sup +/ at 2.08 and 2.14 GeV c.m. energy; I = 0 and J/sup P/ = 3/sup -/ at 2.25 GeV; and I = 1 and J/sup p/ = 0/sup +/ 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/sub ..pi../ which involves the operators of one-pion production and a system transformation. All the parameters in V/sub ..pi../ 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/sub 1/ ..pi..d phase shift (T matrix) calculated using V/sub ..pi../ is in close agreement with reported phase-shift-analysis data (B/sub 1//sup 2/(2.14)1/sup +/). The predictions of the present model are quite consistent with the existing data both for the narrowmore » dibaryon resonances observed in various reactions, as well as for the broad dibaryon resonances.« less