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We propose and apply a new approach to determining $|V_{us}|$ usingdispersion relations with weight functions having poles at Euclidean(space-like) momentum which relate strange hadronic $\tau$ decay distributionsto hadronic vacuum polarization functions (HVPs) obtained from lattice QCD. Weshow examples where spectral integral contributions from the region whereexperimental data have large errors or do not exist are strongly suppressed butaccurate determinations of the relevant lattice HVP combinations remainpossible. The resulting $|V_{us}|$ agrees well with determinations from $K$physics and 3-family CKM unitarity. Advantages of this new approach over theconventional hadronic $\tau$ decay determination employing flavor-breaking sumrules are also discussed.

Novel $|V_{us}|$ Determination Using Inclusive Strange $\tau$ Decay and Lattice HVPs