Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-01-19
Phys.Lett. B505 (2001) 119-124
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 pages, Latex, 2 figs using Axodraw. Minor changes: (1) more detailed description of the model; (2) some re-wording for clar
Scientific paper
10.1016/S0370-2693(01)00323-9
We study the form factors of the low energy anomalous pion-2-photon and photon-3-pion processes in the nonlocal chiral quark model which incorporates the momentum dependence of the dynamical quark mass and realizes correctly the chiral symmetries. The obtained slope parameter for pion-2-photon is in reasonable agreement with the direct experimental results but smaller than the ones invoking vector meson dominance. Our result for the photon-3-pion form factor interpolates between the two extremes of theoretical approaches, with the largest one provided by the vector meson dominance and the smallest one by the Schwinger-Dyson approach. But all of them are well below the single data point available so far. This situation will hopefully be clarified by the experiments at CEBAF and CERN.
Li Xiao-yuan
Liao Yanbiao
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