Abstract
In this study, we tentatively identify as the molecular state and distinguish the isospins of current operators to explore in detail the, , , , , , , and molecular states without strange, with strange, and with double strange in the framework of QCD sum rules. The present exploration favors identifying () as the () molecular state with the spin-parity () and isospin , and the observation of their cousins with the isospin in the invariant mass distributions would decipher their inner structures.
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