Publication Title

Physical Review C

Publication Date

7-2008

Document Type

Article

DOI

10.1103/PhysRevC.78.015206

Keywords

invariant-mass spectrum, photons, η→π0γγ decay

Disciplines

Physics

Abstract

New results on the rare, doubly radiative decay η→π0γγ have been obtained from a revised analysis of the Crystal Ball experiment performed at the AGS. The analysis yields the first information on the dependence of the decay width, Γ(η→π0γγ), on the two-photon invariant mass squared, m2(γγ). A re-evaluation of the branching ratio is also made, BR(η→π0γγ)=(2.21±0.24stat±0.47syst)×10−4; it implies that the decay width is Γ(η→π0γγ)=0.285±0.031stat±0.061syst eV. These results are close to predictions based on chiral perturbation theory with vector-meson dominance.


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