Abstract
We review our recent progresses made in the study of the structure and decay properties of the newly observedd*(2380) within a chiral constituent quark model. It is found that thed*(2380) can be explained as a compact hexaquark-dominated exotic state with a fraction of hidden color components of about 2/3 in its configuration. Based on this scenario the single- and double- pionic partial decay widths are calculated and the corresponding numerical results are in good agreement with the experimental data.
Highlights
Most of the observed hadrons can be categorized into mesons and baryons, which are composed of a pair of constituent quark-antiquark and three constituent quarks, respectively
In systems with six constituent quarks, deuteron is for a few decades the only two-baryon molecule confirmed by experiments
In a partial wave analysis of the neutron-proton scattering data performed by the WASA-at-COSY Collaboration and SAID Data Analysis Group, a resonance pole at (2380 ± 10) − i (40 ± 5) MeV in the 3D3-3G3 coupled-channel partial waves has been reported [8, 9] when the newly observed analyzing power data for the polarized ⃗np scattering reaction has been incorporated into the old data base for np scattering
Summary
Most of the observed hadrons can be categorized into mesons and baryons, which are composed of a pair of constituent quark-antiquark and three constituent quarks, respectively. When explaining d∗(2380) as a ∆∆ bound state, it is found that the calculated decay width is too large compared with data, even the mass can be reproduced properly [10].
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