Abstract
New results on the rare, doubly radiative decay 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, , on the two-photon invariant mass squared, . A re-evaluation of the branching ratio is also made, ; it implies that the decay width is eV. These results are close to predictions based on chiral perturbation theory with vector-meson dominance.
1 More- Received 21 March 2008
DOI:https://doi.org/10.1103/PhysRevC.78.015206
©2008 American Physical Society