# 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…

## 54 Citations

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Abstract
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