  Based on an effective chiral theory of mesons the dependences of
$\rho-\omega$ mixing and the vertex $\omega\pi\pi$ on $m_d-m_u$ are found. The
form factor of pion agrees with data in both space- and time-like regions. CVC
is satisfied. The values of g-2 of muon from $\pi\pi$ channel are calculated in
the range of $q^2<1.3^2 GeV^2$.
