Comment on `Analysis of O(p^2) Corrections to <2pi|Q_{7,8}|K>'

Abstract

We extend in several respects our earlier work on O(p^2) corrections to matrix elements of the electroweak penguin operator O_{ewp}. First, to facilitate comparison with certain lattice studies we calculate O(p^2) corrections to <pi|O_{ewp}|K> in the SU(3) limit of equal light quark masses. Next, we demonstrate how an apparent disagreement in the literature regarding whether higher order chiral contributions increase or decrease <2pi_{I=2}|O_{ewp}|K> is simply a consequence of how the leading order chiral amplitude is defined. Finally, we address an aspect of the epsilon'/epsilon problem by estimating O(p^2) corrections to recent determinations of <2pi_{I=2}|Q_{7,8}|K> which were carried out in the chiral limit.

6 pages, Reference added and typo corrected

References in corpus (5)

• The Standard Model Prediction for epsilon'/epsilon
• Matching the Electroweak Penguins $Q_7$, $Q_8$ and Spectral Correlators
• Effects of Quenching and Partial Quenching on Penguin Matrix Elements
• Determination of <2pi_{I=2}|Q_{7,8}|K0> in the Chiral Limit
• A Critical Reassessment of Q7 and Q8 Matrix Elements

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• Kaon Decays in the Standard Model
• Kaon Matrix Elements and CP-violation from Quenched Lattice QCD: (I) the 3-flavor case
• Direct CP violation in $K^0\to \pi \pi$: Standard Model Status
• Improved Determination of the Electroweak Penguin Contribution to epsilon'/epsilon in the Chiral Limit
• Neutrinoless double beta decay and chiral $SU(3)$
• Remarks on the hadronic matrix elements relevant to the SUSY K-Kbar mixing amplitude
• On lattice extraction of K --> pi pi amplitudes to O(p^4) in Chiral Perturbation Theory
• Lattice extraction of $K\to \pi \pi$ amplitudes to NLO in partially quenched and in full chiral perturbation theory
• Matching the Electroweak Penquins Q_7 and Q_8
• K to pi and K to 0 in 2+1 Flavor Partially Quenched Chiral Perturbation Theory
• K -> pi pi Electroweak Penguins in the Chiral Limit
• Chiral Logarithms in $\Delta S=1$ Kaon Decay Amplitudes in General Effective Flavor Theories