Composite-meson model and meson exchange currents
Physics Department, New York City College of Technology, The City University of New York, 11201, Brooklyn, NY, USA
Accepted: 15 October 2006
Published online: 22 February 2007
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 –
© Società Italiana di Fisica and Springer-Verlag, 2007