A mixed τ-electroproduction sum rule for |Vus|

The interpretation of results of recent τ decay determinations of |Vus|, which yield values ∼3σ low compared to 3-family unitarity expectations, is complicated by the slow convergence of the relevant integrated D=2 OPE series. We introduce a class of new sum rules involving both electroproduction and τ decay data designed to deal with this problem by strongly suppressing D=2 OPE contributions at the correlator level. Experimental complications are briefly discussed and an example of the improved control over theoretical errors presented. The uncertainty on the resulting determination, |Vus|=0.2202(39), is entirely dominated by experimental errors, and should be subject to significant near-term improvement.