Resummed photon spectrum in radiative Υ decays -: art. no. 032001

We present a theoretical prediction for the photon spectrum in radiative Y decay including the effects of resumming the end point region, E-gamma-->M-Y/2. Our approach is based on nonrelativistic QCD (NRQCD) and the soft-collinear effective theory. We find that our results give much better agreement with data than the leading order NRQCD prediction.