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I'm studying some lectures on electroweak interactions and I was reading the paper from Kobayashi and Maskawa, particulary the matrix :

But these matrix have to be unitary... And my professor said that it was not the case. When I compute the product of this matrix and its conjugate transpose, I actually don't find the identity matrix but I don't rely on my computation...

Is there REALLY an error in the paper ?

(I computed for many values of θ1, θ2 and θ3 numerically the product and I never have the identity.)

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# Kobayashi Maskawa Matrix Error ?

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