The decay $ρ^0 \to π^+ π^- γ$ and the chiral invariant interactions of vector mesons

Details The decay $ρ^0 \to π^+ π^- γ$ and the chiral invariant interactions of vector mesons The decay $ρ^0 \to π^+ π^- γ$ and the chiral invariant interactions of vector mesons

1995-06-07

arxiv.org/abs/hep-ph/9506257v1

Phys.Lett. B357 (1995) 221-224

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, latex

Scientific paper

10.1016/0370-2693(95)00869-M

Using the close relationship between the low--energy constants of chiral perturbation theory and the chiral invariant interactions of the vector meson resonances with the pseudoscalar mesons, we investigate the process $\rho^0 \ra \pi^+ \pi^- \gamma$. Compared with the contribution from the pure bremsstrahlung mechanism, we find an enhancement of the decay rate near the endpoint of the photon energy spectrum. Such a particular shape of the differential decay rate has indeed been observed experimentally and turns out to be an important confirmation of the theoretical concept of chiral vector meson dominance.

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