Two-photon processes of pseudoscalar mesons in a Bethe-Salpeter approach

Details Two-photon processes of pseudoscalar mesons in a Bethe-Salpeter approach Two-photon processes of pseudoscalar mesons in a Bethe-Salpeter approach

1996-05-03

arxiv.org/abs/hep-ph/9605219v2

Phys.Lett. B387 (1996) 14-20

Physics

High Energy Physics

High Energy Physics - Phenomenology

RevTeX style, 15 pages, 1 PS figures, uses epsf.sty, minor revisions of the text, small additions to the table and to one figu

Scientific paper

10.1016/0370-2693(96)00990-2

We evaluate the $\pi^0\gamma^* \to \gamma$ transition form factor and $\gamma\gamma$ decay widths for $\pi^0, \eta_c$ and $\eta_b$ treated as $q\bar{q}$ bound states in the Bethe-Salpeter formalism, incorporating the dynamical chiral symmetry breaking and the Goldstone nature of the pion. In the chiral limit, the Abelian axial anomaly is incorporated analytically in our coupled Schwinger-Dyson and Bethe-Salpeter approach, which is also capable of quantitatively describing systems of heavy quarks, concretely $\eta_c$ and possibly $\eta_b$.

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