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arXiv · hep-ph/9907539

Two-point function of strangeness-carrying vector-currents in two-loop Chiral Perturbation Theory

Stephan Dürr·Joachim Kambor
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Abstract

We calculate the correlator between two external vector-currents having the quantum-numbers of a charged kaon. We give the renormalized expression to two loops in standard chiral perturbation theory in the isospin limit, which, as a physical result, is finite and scale-independent. Applications include a low energy theorem, valid at two loop order, of a flavor breaking combination of vector current correlators as well as a determination of the phenomenologically relevant finite $O(p^6)$-counterterm combination $Q_V$ by means of inverse moment finite energy sum rules. This determination is less sensitive to isospin-breaking effects than previous attempts.

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Stephan Dürr, Joachim Kambor. 2000-01-27. Two-point function of strangeness-carrying vector-currents in two-loop Chiral Perturbation Theory. https://doi.org/10.1103/physrevd.61.114025

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