Composite-meson model and meson exchange currents
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We study the meson exchange currents (MEC) mechanism for the pion double-charge exchange (DCX) reaction in a composite-meson model. The model assumes that the mesons are two-quark systems and can interact with each other only through quark loops. The contributions of the ρ, σ, and f0 mesons, the four-quark box diagram as well as a contact diagram has been taken into account. It is shown that the contribution of the ρ, σ, and f0 mesons increases the forward scattering cross-section in an average by 25% and decreases with energy.
PACS.25.80.Gn Pion charge-exchange reactions 25.80.Hp Pion-induced reactions
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