Abstract
The quartic derivative terms of the chiral Lagrangian for ππ scattering are reanalysed using the forward dispersion relation. It is shown that the π + π 0 and π 0 π 0 total cross sections above 1 GeV make contributions to the Skyrme and non-Skyrme terms, 10% and 30% respectively, of the low-energy contributions. For both the quartic terms, the high- contribution tends to cancel the finite width corrections, leaving a strength given by vector and scalar meson dominance, consistent with low-energy ππ data. In particular our analysis shows clearly that vector meson dominance, as often used in pion physics, can now be justified in a reliable manner.
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