Width of exotics from QCD sum rules : Tetraquarks or molecules?

@article{Lee2008WidthOE,
  title={Width of exotics from QCD sum rules : Tetraquarks or molecules?},
  author={Su Houng Lee and Kenji Morita and Marina Nielsen},
  journal={Physical Review D},
  year={2008},
  volume={78},
  pages={076001}
}
(4250) using QCD sum rules. Extending previous analyses regarding these states as diquark-antiquark states or molecules of D mesons, we introduce the Breit-Wigner function in the pole term.We find that introducing the width increases the mass at small Borel window region. Using theoperator-product expansion up to dimension 8, we find that the sum rules based on interpolatingcurrent with molecular components give a stable Borel curve from which both the masses andwidths of these resonances can be… 

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