On the Status of VtdV_{td}, VtsV_{ts} and VtbV_{tb}

preprint2011arXivOpen access

Abstract

The CKM matrix elements VtdV_{td}, VtsV_{ts} and VtbV_{tb}, while notoriously hard to measure directly in experiment, can be determined to great precision within the Standard Model (SM) with a minimal set of observables due to unitarity of VCKMV_{\rm CKM}. We discuss the potential modifications of these elements in extensions with non-unitary quark mixing matrices.

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