期刊
EUROPEAN PHYSICAL JOURNAL A
卷 34, 期 2, 页码 185-196出版社
SPRINGER
DOI: 10.1140/epja/i2007-10500-9
关键词
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We determine two-particle scattering phase shifts and mixing angles for quantum theories defined with lattice regularization. The method is suitable for any non-relativistic effective theory of point particles on the lattice. In the center-of-mass frame of the two-particle system we impose a hard spherical wall at some fixed large radius. For channels without partial-wave mixing the partial-wave phase shifts are determined from the energies of the nearly spherical standing waves. For channels with partial-wave mixing further information is extracted by decomposing the standing wave at the wall boundary into spherical harmonics, and we solve coupled-channels equations to extract the phase shifts and mixing angles. The method is illustrated and tested by computing phase shifts and mixing. angles on the lattice for spin-1/2 particles with an attractive Gaussian potential containing both central and tensor force parts.
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