Two-Loop Analysis of Vector Current Propagators in Chiral Perturbation Theory

Abstract

We perform a calculation of the isospin and hypercharge vector current propagators (${\Delta }_{V33}^{\mu \nu }(q^2)$ and ${\Delta }_{V88}^{\mu \nu }(q^2)$) to two loops in chiral perturbation theory. The analysis is carried out with straightforward Feynman diagram methods by making appropriate use of external vector sources. Counterterms from the $\mathcal{O}(q^6)$ chiral lagrangian, required to absorb divergences and scale dependence encountered at the two-loop level, are constructed. Our final results are finite, covariant, and scale-independent. Several applications are described, including a comparison of the two-loop isospin vector spectral function with data and the construction of new chiral sum rules.

To appear in Nucl. Phys. B (Changes in Sects. 4,8)

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• Extension of the Chiral Perturbation Theory Meson Lagrangian to Order $P^6$
• Low-Energy Photon-Photon Collisions to Two-Loop Order
• The Reaction $\gamma \gamma \to {\pi }^0{\pi }^0$ in Generalized Chiral Perturbation Theory

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