Effective Lagrangian approach to vector mesons, their structure and decays${}^{\ast )}$

Abstract

An improved update of the structure and decays of ${\rho }^0$, $\omega$ and $\varphi$ mesons based on a chiral SU(3) Lagrangian, including anomaly terms is presented. We demonstrate that a consistent and quantitatively successful description of both pion and kaon electromagnetic form factors can be achieved. We also discuss the $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^0{\pi }^{-}$ cross section, the Dalitz decay $\omega \to {\pi }^0{\mu }^{+}{\mu }^{-}$ and aspects of ${\rho }^0\omega$ and $\omega \varphi$ mixing. Relations to previous versions of the Vector Meson Dominance model will be examined.

Comments: 35 pages, TeX, 14 ps figures, submitted to Z.Phys.A