Evolution of wave-packet spread under sequential scattering of particles of unequal mass.

@article{Schulman2004EvolutionOW,
  title={Evolution of wave-packet spread under sequential scattering of particles of unequal mass.},
  author={L. S. Schulman},
  journal={Physical review letters},
  year={2004},
  volume={92 21},
  pages={210404}
}
Under assumptions on initial wave-packet spreads and particle interactions, different mass particles scattering off one another will have the product sigma(2)(i)m(i) converge to a common value, where sigma(i) is the spread and m(i) is the mass of the ith particle. When this relation is satisfied, kinematic entanglement vanishes.