Heavy Quark Effective Theory, Interpolating Fields and Bethe-Salpeter Amplitudes
F. Hussain, G. Thompson
Abstract
We use the LSZ reduction theorem and interpolating fields, alongwith the heavy quark effective theory, to investigate the structure of the Bethe-Salpeter amplitude for heavy hadrons. We show how a simple form of this amplitude, used extensively in heavy hadron decay calculations, follows naturally upto O(1/M) from these field theoretic considerations.
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