Dibaryon Mass and Width Calculation with Tensor Interaction

Abstract

The effect of tensor interaction due to gluon and Goldstone bosonexchange on the dibaryon mass and decay width has been studied inthe framework of the quark delocalization and colour screening model.The effective S–D wave transition interactions induced by gluon andGoldstone boson exchanges decrease quickly with the increasing channelstrangeness, and there is no six-quark state in the light flavour world,which can become a bound one by the help of these tensor interactions,except for the deuteron. The K and η meson exchange effect has beenshown to be negligible after a short-range truncation in this modelapproach. The partial D-wave decay widths, from the NΩ state tothe ΛΞ final states of spins 0 and 1, are 20.7 keV and63.1 keV respectively. This is a very narrow dibaryon resonance, that mightbe detected in the relativistic heavy ion reaction by the existing RHICdetectors through the reconstruction of the ΛΞ vertexmass and by the future COMPAS detector at CERN and the FAIR project in Germany.