Abstract
Recent studies on the newly observed resonance [Formula: see text] with a compact structure in a chiral SU(3) constituent quark model are briefly reported. the overall properties, including the mass, the partial decay widths in various decay modes, and the total width, comparing with the experimental data, show that a compact hexaquark dominated structure might be a reasonable interpretation for this state. Moreover, the charge distribution of [Formula: see text] is also discussed.
Highlights
The d∗ state has intensively been studied by various models from the hadronic degrees of freedom to the quark degrees of freedom more than fifty years
A series of experimental studies for such a state, including various double- and single-pion decays in the pn interactions, the analyzing power of the neutron-proton scattering and etc., have carefully been carried out by CELSIUS/WASA and WASA@COSY Collaborations.[1,2,3,4]. They announced that a new resonance with a mass of about 2380 MeV, an averaged narrow width of about 75 MeV, and the quantum numbers of I = 0 and JP = 3+ has been observed in the above mentioned nuclear processes, and such a state is just the d∗ state which has been hunted for several decades
One of them (Scenario A) assumes that the d∗ state has a compact structure, and may be an exotic hexaquark dominated state.[5,6,7,8,9,10,11]. Another one proposes (Scenario B) that the d∗ state is basically a molecular-like hadronic state with a ∆∆ − D12π mixing,[12] which originates from a three-body ∆N π resonance assumption[13, 14] and a D12π molecular-like model.[15]
Summary
The d∗ state has intensively been studied by various models from the hadronic degrees of freedom to the quark degrees of freedom more than fifty years. One of them (Scenario A) assumes that the d∗ state has a compact structure, and may be an exotic hexaquark dominated state.[5,6,7,8,9,10,11] Another one proposes (Scenario B) that the d∗ state is basically a molecular-like hadronic state with a ∆∆ − D12π mixing,[12] which originates from a three-body ∆N π resonance assumption[13, 14] and a D12π molecular-like model.[15] Which structure is more reasonable should be judged by the experimental data In this talk, we will concentrate our attention on the first scheme by discussing the properties of the d∗(2380) state with an exotic hexaquark dominated structure.
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