Octet contributions in radiative upsilon decays
Xavier Garcia i Tormo
Abstract
We analyze the end-point region of the photon spectrum in semi-inclusive radiative decays of very heavy quarkonium (m alphas2 >> LambdaQCD). The S- and P-wave octet shape functions are calculated. When they are included in the analysis of the photon spectrum of the Upsilon (1S) system the agreement with data becomes excellent.
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