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i'm looking at one-loop calculations in terms of helicity spinor (basically a paper by Brandhuber, Travglini and others) language but i have no idea how to integrate them :)

For instance

[tex]

\int FeynParam\int d^D L \frac{\langle a|L|b]^2}{(L^2-\Delta^2)^3}

[/tex]

How would I do the loop intergation here?

Cheers,

earth2

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# Loop Integration in Spinor Language

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