A five-parameter quark mass matrix texture with the imposed ratio λu/λd = -i tan(π/8) fits the quark mass ratios and CKM observables and encodes the unitarity triangle angles α≈π/2 and β≈π/8.
Fritzsch, Calculating the Cabibbo angle , Phys
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Unitarity triangle angles explained: a predictive new quark mass matrix texture
A five-parameter quark mass matrix texture with the imposed ratio λu/λd = -i tan(π/8) fits the quark mass ratios and CKM observables and encodes the unitarity triangle angles α≈π/2 and β≈π/8.