QCD Condensates for the Light Quark V-A Correlator
V. Cirigliano, E. Golowich, K. Maltman
Abstract
We use the procedure of pinched-weight Finite Energy Sum Rules (pFESR) to determine the OPE coefficients a6, ...,a16 of the flavor ud V-A correlator in terms of existing hadronic tau decay data. We show by appropriate weight choices that the error on the dominant d=6 contribution, which is known to be related to the K -> Pi Pi matrix elements of the electroweak penguin operator in the chiral limit, may be reduced to below the ~15% level. The values we obtain for the OPE coefficients with d>8 are shown to naturally account for the discrepancies between our results for the d=6 and d=8 terms and those of previous analyses, which were obtained neglecting d>8 contributions.
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