Radiative B-decay as a test of CKM unitarity

We point out that $R \equiv Br(b\rightarrow d γ)/Br(b\rightarrow s γ)$ is a sensitive probe of possible violation of CKM unitarity. We compute $R$ in a minimal extension of the Standard Model containing an additional isosinglet charge ($-1/3$) quark, which leads to a deviation from CKM unitarity.

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