Naturalness of CP violation in the standard model.
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We construct a natural measure on the space of Cabibbo-Kobayashi-Maskawa matrices in the standard model, assuming the fermion mass matrices are randomly selected from a distribution which incorporates 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 approximately 3 x 10(-5). We find that the observed value, while well below the mathematically allowed maximum, is in fact typical once the observed quark masses are assumed.
author list (cited authors)
Gibbons, G. W., Gielen, S., Pope, C. N., & Turok, N
complete list of authors
Gibbons, Gary W||Gielen, Steffen||Pope, CN||Turok, Neil