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About: Wave function renormalization     Goto   Sponge   NotDistinct   Permalink

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In quantum field theory wave function renormalization is a rescaling (or renormalization) of quantum fields to take into account the effects of interactions. For a noninteracting or free field the field operator creates or annihilates a single particle with probability 1. Once interactions are included, however, this probability is modified in general to Z 1. This appears when one calculates the propagator beyond leading order; e.g. for a scalar field, (The shift of the mass from m0 to m constitutes the mass renormalization.)