Strange Tribaryons as Nona-Quark States
Strange tribaryons as nona-quark (nine quark) states are studied in an attempt to describe the S=-1 resonance S^0(3115) recently discovered in the reaction K^-+^4He→S^0+p. We have identified S^0(3115) as a member of a flavor 27-plet, specifically, (F_<flavor>, I_<isospin>, J_<spin>)=(27, 1, 1/2) or (27, 1, 3/2). We investigate the mass splittings of the nona-quark system from the point of view of the color-magnetic interaction and the flavor SU_F(3) breaking. The color-magnetic interaction between quarks favors small multiplets in flavor and spin, which leads to the natural explanation that I=1 is the lowest state among the S=-1 tribaryons with J=1/2. Classification of the S^+ state recently reported as well as possible locations of other light strange tribaryons, such as (10^*, 0, 3/2) with S=-1, (8, 1/2, 1/2) with S=-2, and (1, 0, 3/2) with S=-3, is also studied.
- Progress of Theoretical Physics
Progress of Theoretical Physics 114(2), 317-327, 2005-08
Published for the Yukawa Institute for Theoretical Physics and the Physical Society of Japan