A new paper by two Chinese investigators offers the conjecture that the CP violating phase of the PMNS matrix has a best fit estimated value of 39 degrees, with a range of 0 to 59 degrees.
The paper notes slightly broken symmetries in the CKM matrix that emerge when different parameterizations of its that produce almost identical CP violating phases are considered, and hypothesizes that these could be generalized to the PMNS matrix where the symmetries seem to be somewhat more strongly broken.
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