Vector-meson sum rules from current commutators. I

Vector-meson sum rules are obtained from a charge commutator and from three mixed charge-current commutators using the noncovariant approach. In deriving these results, we use the most general form for the matrix elements of the weak hadron currents and for strong-interaction vertices, consistent with Lorentz covariance. Our results are compared with those obtained by dispersion-relation, covariant techniques, and with available experimental data.