  The pseudoscalar-vector-vector correlator is constructed using two meson
multiplets in the vector and two in the pseudoscalar channel. The parameters
are constrained by the operator product expansion at leading order where two or
all three momenta are considered as large. Demanding in addition the
Brodsky-Lepage limit one obtains (in the chiral limit) a pion-vector-vector
correlator with only one free parameter. The singly virtual pion transition
form factor and the decay width of omega to pion and photon are independent of
this parameter and can serve as cross-checks of the results. The free parameter
is determined from a fit of the omega-pion transition form factor. The
resulting pion-vector-vector correlator is used to calculate the decay widths
of omega to pion and dielectron and to pion and dimuon and finally the widths
of the rare decay pion to dielectron and of the Dalitz decay pion to photon and
dielectron. Incorporating radiative QED corrections the calculations of
neutral-pion decays are compared to the KTeV results. We find a deviation of 2
sigma or less for the rare pion decay.
