Kavli Affiliate: Nathan Lewis
| Summary:
We use loop induced processes like meson oscillations and rare b hadron decays to determine the absolute values of the CKM matrix elements $|V_ub|$ and $|V_cb|$ and compare our results to the standard determinations based on inclusive and exclusive semileptonic tree-level decays of B mesons. For many years there have been tensions between the inclusive and exclusive determinations. Assuming the absence of new physics, we find that meson oscillation data shows a slight preference for the inclusive value of $|V_cb|$ and the exclusive value for $|V_ub|$. Rare b decay data prefers values for $|V_cb|$ far below the inclusive and exclusive determinations, offering a new perspective on some of the persistent rare b decay anomalies.
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