I think the diagrammer is worth leaving through a bit, even as a complete non-expert: http://cds.cern.ch/record/186259/files/CERN-73-09.pdf http://cds.cern.ch/r

I think the diagrammer is worth leaving through a bit, even as a complete non-expert: http://cds.cern.ch/record/186259/files/CERN-73-09.pdf http://cds.cern.ch/record/186259/files/CERN-73-09.pdf These are the very practical rules of computing some of the most fundamental quantities in our universe, all explained in slightly more than 100 pages.