{eta}{r_arrow}{pi}{sup 0}{gamma}{gamma} decay in the three-flavor Nambu{endash}Jona-Lasinio model

Journal Article · Sat Nov 30 23:00:00 EST 1996 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.54.6777· OSTI ID:397750

Nemoto, Y; Oka, M ^[1]; Takizawa, M ^[2]

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1. Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152 (Japan)
2. Institute for Nuclear Study, University of Tokyo, Tanashi, Tokyo 188 (Japan)

We study the {eta}{r_arrow}{pi}{sup 0}{gamma}{gamma} decay via the quark-box diagram in the three-flavor Nambu{endash}Jona-Lasinio model that includes the U{sub {ital A}}(1)-breaking effect. We find that the {eta}-meson mass, the {eta}{r_arrow}{gamma}{gamma} decay width, and the {eta}{r_arrow}{pi}{sup 0}{gamma}{gamma} decay width are in good agreement with the experimental values when the U{sub {ital A}}(1) breaking is strong and the flavor SU(3) singlet-octet mixing angle {theta} is about zero. The photon invariant mass spectra in {eta}{r_arrow}{pi}{sup 0}{gamma}{gamma} are compared with those in the chiral perturbation theory. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 397750
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 11 Vol. 54; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CHIRAL SYMMETRY
ETA MESONS
FEYNMAN DIAGRAM
FLAVOR
GAMMA DECAY
MASS SPECTRA
MIXING
PERTURBATION THEORY
PIONS NEUTRAL
SU-3 GROUPS
SYMMETRY BREAKING
U-1 GROUPS
UNIFIED GAUGE MODELS