Kavli Affiliate: Jonathan Rosner
| Summary:
We discuss the possibility that the two nearby resonances observed by BESIII partially below the ,$pbar p$, threshold might be due to mixing between two metastable states with the same $J^PC=0^-+$ quantum numbers, but rather different internal structure. One is a $p bar p$ hadronic molecule and the other a bound state of a light-quark diquark and an antidiquark, both with spin 1 and isospin 0, a composite color antitriplet and triplet, respectively. The doubling of resonances, one of which may be interpreted as a hadronic molecule, while the other arises from $q bar q$ annihilation in a state with vacuum quantum numbers may be a more general feature than the specific case considered here.
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