Hello again,(adsbygoogle = window.adsbygoogle || []).push({});

I also have another question, somewhat related to my previous, on the topic of the Klein-Gordon equation but treating the mass as a perturbation.

The feynman diagram shows the particular interaction:

I believe the cross is the point of interaction via the perturbation (the mass), we model the perturbation:

[tex]\delta V=m^2[/tex]

and subsequently use this in the calculation for the transition amplitude, we use plane-wave solutions of the ingoing and outgoing states.

Alike to my previous question, I'm not really sure what this means to model some potential as a mass? Can anyone explain why we do this and maybe exactly what is happening in this particular feynman diagram?

I can try to embelish if needs be, please tell me if there are any inconsistencies or errors I have made in my explanation of my problem!

Thanks,

SK

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# Treating Mass as a perturbation

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