@article{22304,
  abstract     = {We derive an analog of the Lellouch-Lüscher (LL) relation for few-body bosonic systems, linking few-body scattering loss rates to the energies and widths of the corresponding harmonically trapped few-body states. Three-body numerical simulations show that the LL relation applies across a broad range of interaction strengths and energies and allows the determination of scattering rates within a single partial wave. Our Letter establishes a robust theoretical framework for understanding the role of the finite-volume effect in few-body observables in optical lattice and tweezer experiments, enabling precise determination of multibody scattering rates.},
  author       = {Li, Jinglun and Julienne, Paul S. and Denschlag, Johannes Hecker and D’Incao, José P.},
  issn         = {1079-7114},
  journal      = {Physical Review Letters},
  number       = {20},
  publisher    = {American Physical Society},
  title        = {{Lellouch-Lüscher relation for ultracold few-atom systems under confinement}},
  doi          = {10.1103/pzlp-7k8d},
  volume       = {136},
  year         = {2026},
}