Universal physics of 2+1 particles with non-zero angular momentum
  The zero-energy universal properties of scattering between a particle and a dimer that involves an identical particle are investigated for arbitrary scattering angular momenta. For this purpose, we derive an integral equation that generalises the Skorniakov - Ter-Martirosian equation to the case of non-zero angular momentum. As the mass ratio between the particles is varied, we find various scattering resonances that can be attributed to the appearance of universal trimers and Efimov trimers at the collisional threshold. 
Shimpei Endo, Pascal Naidon, and Masahito Ueda
physics.atom-ph cond-mat.quant-gas