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Phys Rev Lett. 2009 Oct 9;103(15):153201. Epub 2009 Oct 9.

General theoretical description of N-body recombination.

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Department of Physics and JILA, University of Colorado, Boulder, Colorado 80309, USA.


Formulas for the cross section and event rate constant describing recombination of N particles are derived in terms of general S-matrix elements. Our result immediately yields the generalized Wigner threshold scaling for the recombination of N bosons. A semianalytical formula encapsulates the overall scaling with energy and scattering length, as well as resonant modifications by the presence of N-body states near the threshold collision energy in the entrance channel. We then apply our model to the case of four-boson recombination into an Efimov trimer and a free atom.

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