Lsz Formalism

In theoretical physics, the LSZ (reduction) formalism is a method to calculate the S-matrix (the scattering amplitudes) from the time ordered correlation functions of a quantum field theory. It is named for the three german physicists Harry Lehmann, Kurt Symanzik and Wolfhart Zimmermann. This formalism does not cover bound states or massless particles. However, a generalization of LSZ can cover bound states, provided we deal with composite fields which are often nonlocal. Also, the LSZ formalism cannot handle topological solitons at all.

 

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