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

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

2000-08-17

arxiv.org/abs/hep-ph/0008188v1

Phys.Lett.B494:221-228,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 3 figures

Scientific paper

10.1016/S0370-2693(00)01204-1

The radiative $\phi\to\pi^0\eta\gamma$ 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 $B(\phi\to\pi^0\eta\gamma)$ in the range $(0.75$--$0.95)\times 10^{-4}$ is predicted.

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