Eur. Phys. J. A (2007) 31: 662-664
https://doi.org/10.1140/epja/i2006-10192-7

QNP 2006

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

Received: 8 October 2006
Accepted: 15 October 2006
Published online: 22 February 2007

Abstract

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.