Journal
PHYSICAL REVIEW A
Volume 94, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.94.052502
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Funding
- Institute for Nuclear Theory at the University of Washington [INT-16-1]
- French Embassy in Israel
- Pazi Fund
- France's Centre National de la Recherche Scientifique under a grant of IN2P3's Comite de Financement des Projets de Physique Theorique
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-FG02-04ER41338]
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We study universal bosonic few-body systems within the framework of effective field theory at leading order (LO). We calculate binding energies of systems of up to six particles and the atom-dimer scattering length. Convergence to the limit of zero-range two-and three-body interactions is shown, indicating that no additional few-body interactions need to be introduced at LO. Generalizations of the Tjon line are constructed, showing correlations between few-body binding energies and the binding energy of the trimer, for a given dimer energy. As a specific example, we implement our theory for He-4 atomic systems and show that the results are in surprisingly good agreement with those of sophisticated He-4 - He-4 potentials. Potential implications for the convergence of the EFT expansion are discussed.
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