Calculation of a weak nonleptonic matrix element using ``Weinberg'' sum rules
John F. Donoghue
Abstract
There is a ``toy'' weak matrix element which can be expressed as an integral over the vector and axial vector spectral functions, ρV (s) - ρA (s). I review our recent evaluation of these spectral functions, the study of four ``Weinberg'' sum rules and the calculation of this matrix element.
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