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Semi-automatic calculations of multi-loop Feynman amplitudes with AmpRed

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POSTED BY: Wen Chen
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Thanks for the good question. To my knowledge, some specialized techniques (other than the standard modern multi-loop techniques) have been developed for the state-of-art calculations of g-2. Nevertheless, for lower-loop calculations, AmpRed remains a highly suitable tool. It allows us to decouple the loop integrals from the spinor chain from the very beginning, and it provides tools to automatically convert Dirac spinors and gamma matrices to Weyl spinors and Pauli matrices. Furthermore, the decoupled loop integrals can be evaluated with a single command. To illustrate this in detail, I’ll prepare a short notebook in about one month.
POSTED BY: Wen Chen

I hope you can do better than this FeynCalc example.

Also it would be highly appreciated by everyone in this field if the conspiracy theory put forward by Oliver Consa about inability for anyone to verify the infamous IIc Feynman Diagram by running some Mathematica code.

enter image description here

With the finite part popping out like this: enter image description here Which of course also has divergent parts and other regularization artifacts, like in most of the diagrams, that cancel each other to yield actual physical result (seems like the gist of the conspiracy is trying to prescribe some physical meaning to a single diagram, which is just wrong): enter image description here
POSTED BY: Nikolay Murzin
POSTED BY: Nikolay Murzin

enter image description here -- you have earned Featured Contributor Badge enter image description here Your exceptional post has been selected for our editorial columns Staff Picks http://wolfr.am/StaffPicks and Publication Materials https://wolfr.am/PubMat and Your Profile is now distinguished by a Featured Contributor Badge and is displayed on the Featured Contributor Board. Thank you!
POSTED BY: EDITORIAL BOARD
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