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Is there any discussion on what the LSZ theorem for photons looks like? I would rather like a discussion of this in axial gauge $A_0 = 0$ (instead of the usual Lorenz gauge), but anything would do.

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    $\begingroup$ This seems to be asking for a commentary. Is there something specific you want to know? $\endgroup$ – user10851 Sep 13 '13 at 7:09
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    $\begingroup$ This is a reference request I guess... $\endgroup$ – Michael Brown Sep 13 '13 at 7:34
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LSZ reduction for photons is discussed e.g. in (little) Chapter 56 of Srednicki's book

http://adsabs.harvard.edu/abs/2007qft..book.....S

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