The Resummed Photon Spectrum in Radiative Upsilon Decays

Details The Resummed Photon Spectrum in Radiative Upsilon Decays The Resummed Photon Spectrum in Radiative Upsilon Decays

2002-11-19

arxiv.org/abs/hep-ph/0211303v2

Phys.Rev.Lett. 90 (2003) 032001

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 6 figures

Scientific paper

10.1103/PhysRevLett.90.032001

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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