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arxiv: hep-ph/0510384 · v2 · submitted 2005-10-28 · ✦ hep-ph · nucl-th

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Hadronic eta and eta-prime decays

B. Borasoy , R. Nissler
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classification ✦ hep-ph nucl-th
keywords eta-primechiraldecayseffectivehadronicachievedagreementapproach
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The hadronic decays eta, eta-prime -> 3 pi and eta-prime -> eta pi pi are investigated within the framework of U(3) chiral effective field theory in combination with a relativistic coupled-channels approach. Final state interactions are included by deriving s- and p-wave interaction kernels for meson-meson scattering from the chiral effective Lagrangian and iterating them in a Bethe-Salpeter equation. Very good overall agreement with currently available data on decay widths and spectral shapes is achieved.

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  1. Study of $\eta^\prime \to \eta \pi\pi $ Decays in Large-$N_C$ Chiral Perturbation Theory

    hep-ph 2026-05 unverdicted novelty 4.0

    Including ππ final-state interactions in large-Nc ChPT improves agreement with η′ → η ππ data and yields Dalitz parameters a = -0.085(18)stat(4)syst, b = -0.081(10)stat(6)syst, d = -0.045(6)stat(8)syst.