| Title |
Recombination in the universal four-fermion system / |
| Authors |
Deltuva, Arnoldas |
| DOI |
10.1016/j.physletb.2021.136599 |
| Full Text |
|
| Is Part of |
Physics letters B.. Amsterdam : Elsevier. 2021, vol. 820, art. no.136599, p. [1-4].. ISSN 0370-2693. eISSN 1873-2445 |
| Keywords [eng] |
four-particle scattering ; fermionic dimer ; recombination ; universality |
| Abstract [eng] |
In the systems of spin 1 2 fermions with resonant S-wave interactions supporting only weakly bound dimers the antisymmetry forbids recombination of three (or more) fermions at zero energy. However, the fermion-fermion-dimer recombination is only partially suppressed. It is studied in the framework of momentum-space integral equations for the four-particle transition operators. In the vicinity of the unitary limit the fermion-fermion-dimer recombination rate, rescaled to build dimensionless quantity, is found to be linear in the effective range parameter, enabling a simple and accurate parametrization as well as evaluation of finite-range effects for any potential model. This feature makes the present results very useful in benchmarking different methods for three-cluster breakup and recombination calculations in four-particle systems. The interplay of the three-fermion and fermion-fermion-dimer recombination processes and their consequences for ultracold mixtures of fermions and dimers is discussed. |
| Published |
Amsterdam : Elsevier |
| Type |
Journal article |
| Language |
English |
| Publication date |
2021 |
| CC license |
|
