Can the image resonance structures be image and image molecules? Original Research Article

We use QCD sum rules to study the recently observed resonance-like structures in the π+χc1 mass distribution, View the MathML source and View the MathML source, considered as View the MathML source and View the MathML source molecules with the quantum number JP=0+ and JP=1−, respectively. We consider the contributions of condensates up to dimension eight and work at leading order in αs. We obtain mD∗D∗=(4.15±0.12) GeV, around 100 MeV above the D∗D∗ threshold, and mD1D=(4.19±0.22) GeV, around 100 MeV below the D1D threshold. We conclude that the View the MathML source state is probably a virtual state that is not related with the View the MathML source resonance-like structure. In the case of the D1D molecular state, considering the errors, its mass is consistent with both View the MathML source and View the MathML source resonance-like structures. Therefore, we conclude that no definite conclusion can be drawn for this state from the present analysis.