Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-11-10
Phys.Lett.B672:257-263,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 2 figures; minor changes to reflect published version, in particular, details on theoretical uncertainties in conven
Scientific paper
10.1016/j.physletb.2009.01.036
The interpretation of results of recent tau decay determinations of |V_us|, which yield values ~3 sigma 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 sum rules involving both electroproduction and tau 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, |V_{us}| =0.2202(39), is entirely dominated by experimental errors, and should be subject to significant near-term improvement.
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