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Exotic Charmonium and Bottomonium-like Resonances · Around

2011

Exotic Charmonium and Bottomonium-like Resonances

Navarra, F. S., Nielsen, M., Richard, J. -M.

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Many new states in the charmonium and bottomonium mass region were recently discovered by the BaBar, Belle and CDF Collaborations.

We use the QCD Sum Rule approach to study the possible structure of some of these states.
In particular we identify the recently observed bottomonium-like resonance $Z_b^+(10610)$ with the first excitation of the tetraquark $X_b(1^{++})$, the analogue of the X(3872) state in the charm sector.

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