Electromagnetic Pion Form Factor and Neutral Pion Decay Width

Details Electromagnetic Pion Form Factor and Neutral Pion Decay Width Electromagnetic Pion Form Factor and Neutral Pion Decay Width

1994-08-04

arxiv.org/abs/hep-ph/9408233v3

Nucl.Phys.A605:475-495,1996

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, LaTeX, elsart.sty, 5 figures, To appear in Nucl. Phys. A

Scientific paper

10.1016/0375-9474(96)00174-1

The electromagnetic pion form factor, $F_\pi(q^2)$, is calculated for spacelike-$q^2$ in impulse approximation using a confining quark propagator, $S$, and a dressed quark-photon vertex, $\Gamma_\mu$, obtained from realistic, nonperturbative Dyson-Schwinger equation studies. Good agreement with the available data is obtained for $F_\pi(q^2)$ and other pion observables, including the decay $\pi^0 \rightarrow \gamma\,\gamma$. This calculation suggests that soft, nonperturbative contributions dominate $F_\pi(q^2)$ at presently accessible~$q^2$.

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