Naturalness of CP Violation in the Standard Model
Abstract
We construct a natural measure on the space of CKM matrices in the standard model, assuming the fermion mass matrices are randomly selected from a distribution which fits the observed quark mass hierarchy. This measure allows us to assess the likelihood of Jarlskog's CP violation parameter J taking its observed value J ≈ 3 x 10-5. While well below the mathematically allowed maximum, we find that this value is in fact typical, once the observed quark masses are assumed.
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