Diagrammatica : The Path to Feynman Diagrams (Cambridge Lecture Notes in Physics)

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Summary: Why using imaginary time?
Review: I just browsed through this book in a bookshop, so I can't judge its quality (I copied the 5 stars from the current average), but I didn't buy it because I noticed it apparently uses the imaginary time convention! I thought this convention was completely obsolete and thus I am not inclined to buy such a book. Well, Veltman shows how to convert all formulas to conventional metrics in an appendix, but for me this shows how weird the book really is: after all, conventional metrics courses do not show you how to convert their formulas to imaginary time metrics.

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Summary: cernoramam
Review: it's a CERN yellow report from the 1970s sometime. this is the revision and printed version of it. he knows what he is doing, or at least the nobel commitee thought so when he got the prize with t'hooft. anyway it's called diagrammar and you can download it from the CERN site.

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Summary: Thinking with Feynman diagrams
Review: This is a book on quantum field theory using, much more than what is usual, the language of Feynman diagrams, which are pictorial-analytic expressions for terms of the perturbative series for S-matrix elements. Several years ago what could be considered a cruder version of this book circulated widely as a Yellow Report from CERN. It was an admirable text, from which most of us learned how to write the Feynman rules for gauge theories in exotic gauges, and how to renormalize everything by using the dimensional methods. Now comes the book version, polished so that beginners can use it, and with a little more tissue connecting the bones. The Yellow Report was called Diagrammar and became something of a religion. Perusing the book I see no reason why it should not have a comparable success. I particularly admire the graphic derivation of the Ward identities and the (also graphical) treatment of unitarity, very difficult to find antwhere else. The author, Veltman, is a great! authority in Field Theory and a fantastic teacher.