This is a known fact that CKM matrix, a matrix that is used to connect the weak interaction eigenstates to mass eigenstates is unitary. I have studied that this is due to the conservation of probability. i.e. an up type quark will decay into exactly three type of d quarks, nothing more.(adsbygoogle = window.adsbygoogle || []).push({});

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# Unitarity of CKM matrix

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