Towards Precise Determinations of the CKM Matrix without Hadronic Uncertainties

Abstract

We illustrate how the measurements of the CP asymmetries in $B_{d,s}^0$-decays together with a measurement of $Br(K_L\to {\pi }^{\circ }\nu \bar{\nu })$ or $Br(K^{+}\to {\pi }^{+}\nu \bar{\nu })$ and the known value of $\mid V_{us}\mid$ can determine all elements of the Cabibbo-Kobayashi-Maskawa matrix essentially without any hadronic uncertainties. An analysis using the ratio $x_d/x_s$ of $B_d-{\bar{B}}_d$ to $B_s-{\bar{B}}_s$ mixings is also presented.

(Invited talk given at ICHEP '94, Glasgow, July 1994.), 4 pages, Munich Technical University preprint TUM-T31-70/94