Octet contributions in radiative upsilon decays
classification
✦ hep-ph
hep-ex
keywords
decaysoctetphotonradiativespectrumupsilonagreementalpha
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We analyze the end-point region of the photon spectrum in semi-inclusive radiative decays of very heavy quarkonium (m alpha_s^2 >> Lambda_QCD). 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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