We discuss the role of the width of a Feshbach resonance for binary and
ternary collisions. We show that low-energy few-body observables are
universal functions of the resonance width and the scattering length. The
effect of narrow resonances is qualitatively different from that of wide
resonances revealing novel physics of three-boson collisions. We calculate
the rate of three-body recombination to a weakly bound level and the
atom-dimer scattering length and discuss implications for experiments on
Bose-Einstein condensates and atom-molecule mixtures near Feshbach
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