- #1
phylz
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In Peskin's textbook chapter 7 Radiative Corrections: Some formal developments (page 229), he said the Z factors are irrelevant for calculations at the leading order of perturbation theory, but are important in the calculation or higher-order corrections.
My question is how can the Z factor be irrelevant for calculations at the leading order of perturbation theory. Thanks.
My question is how can the Z factor be irrelevant for calculations at the leading order of perturbation theory. Thanks.