In QFT book of Peskin&Schroeder writing(page 252,section 7.5Renormalization of electric Charge):(adsbygoogle = window.adsbygoogle || []).push({});

(e[itex]^{2}[/itex]-e[itex]^{2}_{0}[/itex])/e[itex]^{2}_{0}[/itex]=[itex]\delta[/itex]Z[itex]_{3}[/itex][itex]\approx[/itex]-2[itex]\alpha[/itex]/3[itex]\pi[/itex][itex]\epsilon[/itex].

Where [itex]\epsilon[/itex] is 4-d(d is dim of space-time)

But I think that it is misprint,because bare charge>> observed charge e,then the right formular would be (e[itex]^{2}[/itex]-e[itex]^{2}_{0}[/itex])/e[itex]^{2}[/itex]=.........

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# Is it a misprint in QFT book of Peskin?

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