The Resummed Photon Spectrum in Radiative Upsilon Decays
classification
✦ hep-ph
hep-ex
keywords
upsilonnrqcdphotonpredictionradiativespectrumagreementapproach
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We present a theoretical prediction for the photon spectrum in radiative Upsilon decay including the effects of resumming the endpoint region, E_\gamma -> M_\Upsilon/2. Our approach is based on NRQCD and the soft collinear effective theory. We find that our results give much better agreement with data than the leading order NRQCD prediction.
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