Abstract
Using flavor-breaking chiral sum rules for the difference of flavor ud and us current-current two-point functions, with non-strange and strange hadronic τ decay data as input, we obtain accurate determinations of a number of SU(3) chiral NNLO low-energy constants. These results allow a significant improvement in the combined NNLO continuum-lattice determination of the NLO low-energy constant L10r, producing a current world best determination of L10r, and the first such NNLO determination having all NNLO effects under full control.
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