# 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
}
}
• Published 3 March 2014
• Physics, Medicine
• Physical review letters
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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