Pseudovector components of the pion, pi(0)->gamma gamma, and F-pi(q(2))

As a consequence of dynamical chiral symmetry breaking the pion Bethe-Salpe ter amplitude necessarily contains terms proportional to gamma(5)gamma.P an d gamma(5)gamma.k, where k is the relative and P the total momentum of the constituents. These terms are essential for the preservation of low-energy theorems, such as the Gell-Mann-Oakes-Renner relation and those describing anomalous decays of the pion, and to obtaining an electromagnetic pion form factor that falls as 1/q(2) for large q(2), up to calculable In q(2) corre ctions. In a simple model, which correlates low- and high-energy pion obser vables, we find q(2)F(pi)(q(2))similar to 0.12-0.19 GeV2 for q(2)greater th an or similar to 10 GeV2. [S0556-2813(98)02512-6].