Constraints on the I=1 hadronic tau decay and e+e- --> hadrons data sets and implications for (g-2)mu
Abstract
Sum rule tests are performed on the spectral data for (i) flavor 'ud' vector- current-induced hadronic tau decays and (ii) e+ e- hadroproduction, in the region below s~3-4 GeV2, where discrepancies exist between the isospin- breaking-corrected charged and neutral current I=1 spectral functions. The tau data is found to be compatible with expectations based on high-scale alphas(MZ) determinations, while the electroproduction data displays two problems. The results favor determinations of the leading order hadronic contribution to (g-2)mu which incorporate hadronic tau decay data over those employing electroproduction data only, and hence a reduced discrepancy between experiment and the Standard Model prediction for (g-2)mu.
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