Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-05-02
Phys.Rev. D64 (2001) 034011
Physics
High Energy Physics
High Energy Physics - Phenomenology
24 pages, 6 figures, to appear in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.64.034011
We write down some relevant matrix elements for the scattering and decay processes of the pion by considering a quark-meson vertex function. The pion charge and transition form factors $F_\pi$, $F_{\pi\gamma}$, and $F_{\pi\gamma^*}$ are extracted from these matrix elements using a relativistic quark model on the light-front. We found that, the form factors $F_\pi$ and $F_{\pi\gamma}$ in the space-like region agree well with experiment. Furthermore, the branching ratios of all observed decay modes of the neutral pion, that are related to the form factors $F_{\pi\gamma}$ and $F_{\pi\gamma^*}$ in the time-like region, are all consistent with the data as well. Additionally, $F_\pi$ in the time-like region, which deals with the nonvalence contribution, is also discussed.
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