2005/06/30 by Gui-Jun Ding, Mu-Lin Yan
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.72.034014
published as Phys.Rev. D72 (2005) 034014 · 23 pages, 8 figures, to appear in Phys. Rev. D
arxiv created 2005/08/04 · openalex publication_date 2005/08/18 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
We study the nonaquark states S0(3115) and S+(3140) which are reported by [T. Suzuki (KEK-PS), Phys. Lett. B 597, 236 (2004)M. Iwasaki et al., nucl-ex/0310018] by means of the quark model with diquark correlation. The nonaquark states form 1,8,10,10,27,35 SU(3) multiplets. The flavor wave functions of all the nonaquark states are constructed through the standard tensor technique. The mass spectrum is studied by using the Gell-Mann-Okubo mass formula. Some nonaquark mass sum rules are obtained. We further investigate the decay of S0(3115) and S+(3140) under the assumption of the ``fall-apart'' mechanism. It has been found that the main decay mode is \ensuremathΣNN rather than \ensuremathΛNN which is consistent with experiment. Also we have uniquely determined the flavor wave function of S0(3115) which belongs to the 27-plet with the quantum number Y=2,I=1,Iz=\ensuremath-1. Whereas the exotic states S+(3140) can belong to either the 27-plet or the 35-plet. In the exact SU(3)flavor\ifmmode×\else\texttimes\fiSU(3)color\ifmmode×\else\texttimes\fiSU(2)spin limit, both S0(3115) and S+(3140) belong to the 27-plet with negative parity. We predict that its flavor structure can be determined by measuring the branch fractions of its decay channels. The experiments to check this prediction are as expected.