Six-quark structure of d*(2380) in a chiral constituent quark model
AbstractThe structure of d*(2380) is restudied with the single cluster structure in the chiral SU(3) quark model which has successfully been employed to explain the N-N scattering data and the binding energy of deuteron. The binding behavior of such a six quark system is solved by using a variational method. The trial wave function is chosen to be a combination of a basic spherical symmetric component of [(0s)6]orb in the orbital space with 0ℏω excitation and an inner structural deformation component of [(0s)5(1s)]orb and [(0s)4(0p)2]orb in the orbital space with 2ℏω excitation, both of which are in the spatial orb symmetry. It is shown that the mass of the system is about 2356 MeV, which is qualitatively consistent with the result both from the two-cluster configuration calculation and from the data measured by the WASA Collaborations. When the meson exchange interactions are absent, the attraction is insufficient to form a stable state below the ΔΔ threshold. This result tells us that as long as the medium-range interaction due to the chiral symmetry consideration is properly introduced, the mass of the system will be reduced in a rather large extent. It also implies that the observed d* is a six-quark bound state with respect to the ΔΔ threshold, which again supports the conclusion that d* is a hexaquark dominant state.