eta' to eta pi pi Decay as a Probe of a Possible Lowest-Lying Scalar Nonet

Details eta' to eta pi pi Decay as a Probe of a Possible Lowest-Lying Scalar Nonet eta' to eta pi pi Decay as a Probe of a Possible Lowest-Lying Scalar Nonet

1999-02-03

arxiv.org/abs/hep-ph/9902238v1

Phys.Rev. D60 (1999) 034002

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, 11 figures

Scientific paper

10.1103/PhysRevD.60.034002

We study the eta' to eta pi pi decay within an effective chiral Lagrangian approach in which the lowest lying scalar meson candidates sigma(560) and kappa(900) together with the f0(980) and a0(980) are combined into a possible nonet. We show that there exists a unique choice of the free parameters of this model which, in addition to fitting the pi pi and pi K scattering amplitudes, well describes the experimental measurements for the partial decay width of eta' to eta pi pi and the energy dependence of this decay. As a by-product, we estimate the a0(980) width to be 70 MeV, in agreement with a new experimental analysis.

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