QCD based Calculation of the semi-inclusive Decay \eta_Q \to \gamma + light Hadrons

Abstract

A QCD based calculation of the photon spectrum in semi-inclusive ${\eta }_Q$ decays is performed. The method applied is an effective theory based on a 1/m_Q expansion of QCD.

Comments: Latex, 15 pages, 2 postscript figures included, uses epsf. The complete paper, including figures, is also available via anonymous ftp at ftp://ttpux2.physik.uni-karlsruhe.de/ , or via www at http://www-ttp.physik.uni-karlsruhe.de/cgi-bin/preprints/