Abstract
Recent sum rule determinations of |Vus|, employing flavor-breaking combinations of hadronic τ decay data, are significantly lower than either expectation s based on 3-family unitarity or determinations from Kl3 and Γ[Kμ2]/Γ[πμ2]. We use lattice data to investigate the accuracy/reliabili ty of the OPE representation of the flavor-breaking correlator combination entering the τ decay analyses. The behavior of an alternate correlator combination, constructed to reduce problems associated with the slow convergence of the D= 2 OPE series, and entering an alternate sum rule requiring both electroproduction cross-section and hadronic τ decay data, is also investigated. Preliminary updates of both analyses, with the lessons learned from the lattice data in mind, are also presented.
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