I What is the connection between the Lamb Shift and the g factor?

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Trying to find a connection between these two (Lamb Shift and G factor aka anomalous magnetic moment)
German Wikipedia mentions that the g factor is one of the causes of the Lamb Shift. It does not say why and I am trying to find a connection between these two things. Any ideas?
 
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The anomalous ##g## factor (devisions from 2 for elementary Dirac particles like the electron or muon) are due to the radiative corrections of the ##e\bar{e}\gamma## vertex function, which are also contributing to the Lamb shift of the hydrogen-atom levels.
 
vanhees71 said:
The anomalous ##g## factor (devisions from 2 for elementary Dirac particles like the electron or muon) are due to the radiative corrections of the ##e\bar{e}\gamma## vertex function, which are also contributing to the Lamb shift of the hydrogen-atom levels.
Ah I see. And how are they contributing? What would change if they would not be there?
 
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