Theoretical determination of etab's electromagnetic decay width

Abstract

We discuss the theoretical predictions for the two photon decay width of the pseudoscalar etab meson. Predictions from potential models are examined. It is found that various models are in good agreement with each other. Results for etab are also compared with those from Upsilon data through the NRQCD procedure.

Comments: 5 pages, 3 eps figures, need Elsevier's espcrc2 package. To appear in the Conference Proceedings of the "International Conference on the Structure and Interactions of the Photon" Photon 2003, Laboratori Nazionali di Frascati of INFN, Frascati 7-11 April 2003, Italy