pi- and rho-mesons, and their diquark partners, from a contact interaction

Details pi- and rho-mesons, and their diquark partners, from a contact interaction pi- and rho-mesons, and their diquark partners, from a contact interaction

2011-02-22

arxiv.org/abs/1102.4376v1

Phys.Rev.C83:065206,2011

Physics

Nuclear Physics

Nuclear Theory

12 pages, 7 figures, 2 tables

Scientific paper

10.1103/PhysRevC.83.065206

We present a unified Dyson-Schwinger equation treatment of static and electromagnetic properties of pseudoscalar and vector mesons, and scalar and axial-vector diquark correlations, based upon a vector-vector contact-interaction. A basic motivation for this study is the need to document a comparison between the electromagnetic form factors of mesons and those diquarks which play a material role in nucleon structure. This is an important step toward a unified description of meson and baryon form factors based on a single interaction. A notable result, therefore, is the large degree of similarity between related meson and diquark form factors. The simplicity of the interaction enables computation of the form factors at arbitrarily-large spacelike-Q^2, which enables us to expose a zero in the rho-meson electric form factor at z_Q^\rho ~ Sqrt[6] m_\rho. Notably, r_\rho*z_Q^\rho ~ r_D*z_Q^D, where r_\rho, r_D are, respectively, the electric radii of the rho-meson and deuteron.

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