Abstract
High precision measurements of the differential cross sections for photoproduction at forward angles for two nuclei, and , have been performed for incident photon energies of 4.9–5.5 GeV to extract the decay width. The experiment was done at Jefferson Lab using the Hall B photon tagger and a high-resolution multichannel calorimeter. The decay width was extracted by fitting the measured cross sections using recently updated theoretical models for the process. The resulting value for the decay width is . With the 2.8% total uncertainty, this result is a factor of 2.5 more precise than the current Particle Data Group average of this fundamental quantity, and it is consistent with current theoretical predictions.
- Received 12 September 2010
DOI:https://doi.org/10.1103/PhysRevLett.106.162303
© 2011 American Physical Society