i am encoutering a problem(adsbygoogle = window.adsbygoogle || []).push({});

i use helicity method to caculate six photon amplitude in scalar QED but i don't know explicit form of wave fuction QED . And i need a book with title

" R. Gastmans, Ubiquitous photon: Helicity method for QED and QCD"

where can i find it?

thank you

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# Can you help me

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