QCD Condensates for the Light Quark V-A Correlator
Abstract
We use the procedure of pinched-weight Finite Energy Sum Rules (pFESR) to determine the OPE coefficients a_6, ...,a_16 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.
Cite
@article{arxiv.hep-ph/0305118,
title = {QCD Condensates for the Light Quark V-A Correlator},
author = {V. Cirigliano and E. Golowich and K. Maltman},
journal= {arXiv preprint arXiv:hep-ph/0305118},
year = {2009}
}
Comments
43 pages, 8 figures (higher definition plots available from authors), 2 tables, comment added in Sect. IVC