Variational approach to the evaluation of multi-step amplitudes
- 1 November 1978
- journal article
- Published by IOP Publishing in Journal of Physics G: Nuclear Physics
- Vol. 4 (11) , 1739-1749
- https://doi.org/10.1088/0305-4616/4/11/007
Abstract
The difference between the exact T-matrix and the DWBA amplitude is shown to be the stationary value of a certain functional. Generalised unitarity is used to separate the on-shell and off-shell parts of that value. An expansion of that functional in terms of multi-step processes leads to Pade approximants.Keywords
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