Microscopic origin and universality classes of the Efimov three-body parameter.

@article{Naidon2014MicroscopicOA,
  title={Microscopic origin and universality classes of the Efimov three-body parameter.},
  author={Pascal Naidon and Shimpei Endo and Masahito Ueda},
  journal={Physical review letters},
  year={2014},
  volume={112 10},
  pages={
          105301
        }
}
The low-energy spectrum of three particles interacting via nearly resonant two-body interactions in the Efimov regime is set by the so-called three-body parameter. We show that the three-body parameter is essentially determined by the zero-energy two-body correlation. As a result, we identify two classes of two-body interactions for which the three-body parameter has a universal value in units of their effective range. One class involves the universality of the three-body parameter recently… 

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