# How much CP violation does the weak force cause?

I'm looking for the most readable quantitative explanation, with the least amount of difficult mathematics. Rather than an answer with just a number, I'd like to see the derivation from the CKM matrix.

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Surprisingly, Matt provided you with an answer - an "invariant" - but I find your question bizarre. How can one define "how much CP violation there is"? It depends on the experiment, doesn't it? Some phenomena are strongly affected by it, others are virtually unaffected. You didn't specify any experiment so I don't think that your question as stated makes any sense. Of course that those effects that are CP-violating will have a good quantification in terms of $Prof(E)/Prob(E_{CP})-1$, and this result will ideally start at $\delta_{CKM}^2$. –  Luboš Motl Feb 10 '11 at 7:12
Please feel free to rewrite the question; I'm looking for a simple derivation of the Jarlskog invariant J_CP and wanted to phrase the question so people not knowing that term would still find the question in a search. –  Carl Brannen Feb 10 '11 at 9:29