Quantum Scattering in Strong Cylindrical Confinement

A Green's function formalism to analyze the scattering properties in confined geometries is developed. This includes scattering from a central field inside the guide created e.g. by impurities. For atomic collisions our approach applies to the case of parabolic confinement and, with certain restrictions, also to an anharmonic one. The coupling between the angular momentum phase shifts $\delta_l$ of a spherically symmetric scattering potential $V(r)$ due to the cylindrical confinement is analysed. Under these general conditions, a broad range of scattering energies covering many transversal excitations is considered and changes to the bound states of $V(r)$ are derived. For collisions between identical atoms, the boson-fermion and fermion-boson mappings are demonstrated.