Chiral loops and a_0(980) exchange in ϕ->π^0ηγ

Abstract

The radiative $\varphi \to {\pi }^0\eta \gamma$ decay is discussed emphasizing the effects of the $a_0$(980) scalar resonance which dominates the high values of the ${\pi }^0\eta$ invariant mass spectrum. In its lowest part, the proposed amplitude coincides with the reliable and ChPT-inspired contribution coming from chiral loops. The $a_0$(980) resonance is then incorporated exploiting the complementarity between ChPT and the linear sigma model for this channel. The recently reported experimental invariant mass distribution and branching ratio can be satisfactorily accommodated in our framework. For the latter, a value of $B(\varphi \to {\pi }^0\eta \gamma )$ in the range $(0.75$--$0.95)\times 10^{-4}$ is predicted.

16 pages, 3 figures

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Cited by in corpus (22)

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• Analysis of the nature of the $\varphi \to \gamma \pi \eta$ and $\varphi \to \gamma {\pi }^0{\pi }^0$ decays
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• Decay of light scalar mesons into vector-photon and into pseudoscalar mesons
• Scalar and vector meson exchange in V->P0P0gamma decays
• Radiative $\varphi$ decays with derivative interactions
• Investigation of $J/\psi \to \gamma {\pi }^0\eta ({\pi }^{+}{\pi }^{-},{\pi }^0{\pi }^0)$ radiative decays including final-state interactions
• Interference effects in the decay ϕ\to π^{0}π^{0}γand the coupling constant g_{ϕσγ}
• Scalar $a_0(980)$ meson in $\varphi \to {\pi }^0\eta \gamma$ decay
• Scalar Mesons and Chiral Dynamics
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