Low-lying pseudoscalar and vector mesons and their dynamics

How to describe radiative reactions with an odd number of pions

Department of Physics and Astronomy, Uppsala University, Sweden

^a e-mail: carla.terschluesen@physics.uu.se

Published online: 20 March 2014

Abstract

In chiral perturbation theory, the leading-order contribution to reactions with pions in the sector of odd intrinsic parity is defined by the Wess-Zumino-Witten structure. This structure is supplemented by a simple vector-meson Lagrangian where the vector mesons are described by antisymmetric tensor fields. With the rho-omega-pion coupling as the only parameter in the sector of odd intrinsic parity, i.e. without additional contact terms, one can achieve a proper description of the single- and double-virtual pion transition form factor and the three-pion production in electron-positron collisions.