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

Pascal Naidon, Shimpei Endo, Masahito Ueda

Research output: Contribution to journalArticlepeer-review

77 Citations (Scopus)


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 found in ultracold atom systems. The other is relevant to short-range interactions that can be found in nuclear physics and solid-state physics.

Original languageEnglish
Article number105301
JournalPhysical Review Letters
Issue number10
Publication statusPublished - 2014 Mar 10


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