Abstract
The Crystal Ball detector has been used at the DORIS II storage ring at DESY to study the reaction →γ*γ*→γγ, where X is a narrow resonance with mass between 100 and 3000 MeV. Formation of , η, and η’ mesons is observed, and the following meson partial widths are obtained: =7.7±0.5±0.5 eV, =0.514±0.017±0.035 keV, and =4.7±0.5±0.5 keV. No other narrow resonances are observed, and upper limits are given for the product . .AE
- Received 4 April 1988
DOI:https://doi.org/10.1103/PhysRevD.38.1365
©1988 American Physical Society