Ultracold bosons in the vicinity of a narrow resonance: shallow dimer   and recombination
  The different resonant regimes that can be achieved by using a magnetic Feshbach resonance are analyzed with a separable two-channel model. Emphasis is put on the case of narrow resonances in a region of intermediate detuning where a shallow dimer exists and an approximate law including the background scattering length for the three-body recombination rate is derived. 
Ludovic Pricoupenko (LPTMC), Mattia Jona Lasinio (ITP)
cond-mat.quant-gas quant-ph