2012

Molecular structures in charmonium spectrum: The $XYZ$ puzzle

Ortega, P. G., Entem, D. R., Fernandez, F.

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We study in the framework of a constituent quark model the possible contributions of molecular structures to the XYZ charmonium like states.

We analyze simultaneously the $c\bar{c}$ structures and the possible molecular components in a formalism which allows us to treat channels below and above thresholds.
The only molecular state found in the $1^{++}$ sector correspond to the X(3872).
Molecular resonances also appear with other quantum numbers.

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