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arXiv · hep-ph/9909473

Electromagnetic Corrections to K->pi pi II - Dispersive Matching

V. Cirigliano·J. F. Donoghue·E. Golowich
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Abstract

We express the leading electromagnetic corrections in K-> pi pi amplitudes as integrals over the virtual photon squared-momentum Q^2. The high Q^2 behavior is obtained via the operator product expansion. The low Q^2 behavior is calculated using chiral perturbation theory. We model the intermediate Q^2 region using resonance contributions in order to enforce the matching of these two regimes. The results confirm our previous estimates that the electromagnetic corrections provide a reasonably small shift in the delta I - 3/2 amplitude.

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V. Cirigliano, J. F. Donoghue, E. Golowich. 1999-11-29. Electromagnetic Corrections to K->pi pi II - Dispersive Matching. https://doi.org/10.1103/physrevd.61.093002

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