Relativistic three-body calculations of a image, image, image dibaryon

The image coupled-channel system with quantum numbers image is studied in a relativistic three-body model, using two-body separable interactions in the dominant p-wave pion–baryon and image YN channels. Three-body equations are solved in the complex energy plane to search for quasibound state and resonance poles, producing a robust narrow πΛN resonance about 10–20 MeV below the πΣN threshold. Viewed as a dibaryon, it is a image quasibound state consisting of image and image components. Comparison is made between the present relativistic model calculation and a previous, outdated nonrelativistic calculation which resulted in a πΛN bound state. Effects of adding a image channel are studied and found insignificant. Possible production and decay reactions of this image dibaryon are discussed.