Three-body recombination rates near a Feshbach resonance within a two-channel contact interaction model

Abstract

We calculate the three-body recombination rate into a shallow dimer in a gas of cold bosonic atoms near a Feshbach resonance using a two-channel contact interaction model. The two-channel model naturally describes the variation of the scattering length through the Feshbach resonance and has a finite effective range. We confront the theory with the available experimental data and show that the two-channel model is able to quantitatively describe the existing data. The finite effective range leads to a reduction of the scaling factor between the recombination minima from the universal value of 22.7. The reduction is larger for larger effective ranges or, correspondingly, for narrower Feshbach resonances.

9 pages, 7 figures

References in corpus (6)

• Observation of an Efimov spectrum in an atomic system
• Universality in Three- and Four-Body Bound States of Ultracold Atoms
• Multi-channel scattering and Feshbach resonances: Effective theory, phenomenology, and many-body effects
• A two-channel R-matrix analysis of magnetic field induced Feshbach resonances
• Efimov states embedded in the three-body continuum
• Conditions for Efimov Physics for Finite Range Potentials

Cited by in corpus (8)

• Efimov Physics and the Three-Body Parameter within a Two-Channel Framework
• Finite Range Effects in Energies and Recombination Rates of Three Identical Bosons
• Three-body recombination at finite energy within an optical model
• Few-body physics of ultracold atoms and molecules with long-range interactions
• A multichannel hyperspherical model for Efimov physics with van der Waals interactions controlled by a Feshbach resonance
• Analytic expression for three-body recombination rates into deep dimers
• Tuning of Efimov states in non-integer dimensions
• Stabilization of three-body resonances to bound states in a continuum