Using dimensional regularization we frequently end up with a term 2/(4-d)+ ln(somthing with mass dimension), c.f. Peskin page 250~251, and Peskin said the scale of the logarithm is hidden in the 2/(4-d) term. How is this so? No matter how hard I try to look at 2/(4-d), I see a purely dimensionless number.(adsbygoogle = window.adsbygoogle || []).push({});

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# The ln(m^2) term in dimensional regularization

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