Chiral loops and a0(980) exchange in φ→π0ηγ

2000/08/17 by A. Bramon, R. Escribano, J. L. Lucio M. +3 · 22 citations
Physics and Astronomy · #Branching fraction #Chiral perturbation theory #Invariant (physics) #Invariant mass #Nuclear physics research studies #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Radiative transfer #Resonance (particle physics) #Scalar (mathematics) #Sigma #Sigma model #hep-ex #hep-ph

paper · pdf · doi:10.1016/s0370-2693(00)01204-1

published in Physics Letters B 494(3-4), 221-228 (Elsevier BV) · 16 pages, 3 figures

arxiv created 2000/08/17 · openalex publication_date 2000/11/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

The radiative ϕ→π⁰ηγ decay is discussed emphasizing the effects of the a₀(980) scalar resonance which dominates the high values of the π⁰η invariant mass spectrum. In its lowest part, the proposed amplitude coincides with the reliable and ChPT-inspired contribution coming from chiral loops. The a₀(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(ϕ→π⁰ηγ) in the range (0.75--0.95)× 10^-4 is predicted.

Citations

• Mixing of η-η′ mesons in decays into a vector and a pseudoscalar meson
• Effective Lagrangians and Field Algebras with Chiral Symmetry
• Chiral effective lagrangian in the large-N limit: the nonet case
• The decay
• η−η′ mixing from U(3)L⊗U(3)R chiral perturbation theory
• Analysis of a K -Scattering Phase Shift and Evidence for the (900) Meson

Cited by

• Scalar σ meson effects in ρ and ω decays into π0π0γ
• QCD tests of the puzzling scalar mesons