η→π0γγdecay in the three-flavor Nambu-Jona-Lasinio model

1996/02/08 by Y. Nemoto, M. Oka, Makoto Oka +1 · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.1103/physrevd.54.6777

published as Phys.Rev. D54 (1996) 6777-6781 · 14 pages, LaTeX, 3 EPS figures, uses epsf.sty and feynman.tex

arxiv created 1996/02/08 · openalex publication_date 1996/12/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We study the \ensuremathη\ensuremath→\ensuremathπ⁰\ensuremathγ\ensuremathγ decay via the quark-box diagram in the three-flavor Nambu-Jona-Lasinio model that includes the U_A(1)-breaking effect. We find that the \ensuremathη-meson mass, the \ensuremathη\ensuremath→\ensuremathγ\ensuremathγ decay width, and the \ensuremathη\ensuremath→\ensuremathπ⁰\ensuremathγ\ensuremathγ decay width are in good agreement with the experimental values when the U_A(1) breaking is strong and the flavor SU(3) singlet-octet mixing angle \ensuremathθ is about zero. The photon invariant mass spectra in \ensuremathη\ensuremath→\ensuremathπ⁰\ensuremathγ\ensuremathγ are compared with those in the chiral perturbation theory.

Cited by

• \η \→ \π⁰ \γ \γ decay within unitarized chiral perturbation theory