Diquark-antidiquarks with hidden or open charm and the nature of X(3872)

@article{Maiani2005DiquarkantidiquarksWH,
  title={Diquark-antidiquarks with hidden or open charm and the nature of X(3872)},
  author={L. Maiani and Fulvio Piccinini and Antonio Davide Polosa and Ver{\'o}nica Riquer},
  journal={Physical Review D},
  year={2005},
  volume={71},
  pages={014028}
}
Heavy-light diquarks can be the building blocks of a rich spectrum of states which can accommodate some of the newly observed charmoniumlike resonances not fitting a pure $c\overline{c}$ assignment. We examine this possibility for hidden and open charm diquark-antidiquark states deducing spectra from constituent quark masses and spin-spin interactions. Taking the $X(3872)$ as input we predict the existence of a ${2}^{++}$ state that can be associated to the $X(3940)$ observed by Belle and… 

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