Possible mixing of a diquark-antidiquark with a p p hadronic molecule
Abstract
We discuss the possibility that the two nearby resonances observed by BESIII partially below the \,p p\, threshold might be due to mixing between two metastable states with the same JPC=0-+ quantum numbers, but rather different internal structure. One is a p 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 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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