Value of the Kobayashi-Maskawa-Cabibbo matrix elementVusand flavor-symmetry breaking in hyperon semileptonic decays

We perform a detailed model-independent analysis of the determination of $V_{\mathrm{us}}$ in the $\Delta S=1\mathrm{}$ decays $\Lambda \to \mathrm{pe}\nu$, ${\Sigma }^{-}\to \mathrm{ne}\nu$, and ${\Xi }^{-}\to \Lambda e\nu$. Values systematically higher than the $K_{e3\mathrm{}}$ one are obtained. A reconciliation may be only obtained through second-order changes of a few percent in the leading vector form factors $f_1$, provided that these changes always increase their magnitudes over their conserved vector current (CVC) predictions. Using the CVC or the recoil part of recent flavor-symmetry-breaking calculations, the value $V_{\mathrm{us}}=0.2558\mathrm{}\pm 0.0027$ is obtained, which is higher than the $K_{e3\mathrm{}}$ one by 2.6 standard deviations.