Momentum-space calculation of four-boson recombination

The system of four identical bosons with a large two-boson scattering length is described using momentum-space integral equations for the four-particle transition operators. The creation of Efimov trimers via ultracold four-boson recombination is studied. The universal behavior of the recombination rate is demonstrated.

Figure 1

Trimer and tetramer binding energies as functions of the two-boson scattering length.

Figure 2

Dimensionless four-boson recombination rate ${\kappa }_n$ as a function of two-boson scattering length.

Figure 3

Relative weights ${\nu }_{n,n^{\prime }}$ for the production of the $n^{\prime }$th state trimers via four-boson recombination. $n=4$ atom-trimer channels contribute in the shown regime.