The Upsilon -> X gamma photon spectrum in the soft-energy region

Details The Upsilon -> X gamma photon spectrum in the soft-energy region The Upsilon -> X gamma photon spectrum in the soft-energy region

2009-04-30

arxiv.org/abs/0904.4875v1

PoS EFT09:005, 2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 5 figures. Contribution to the proceedings of EFT'09 - International Workshop on Effective Field Theories: from the P

Scientific paper

The dominant contribution of the next-to-leading order perturbative QCD corrections to the Upsilon -> X gamma photon energy spectrum for photon energies w ~ m_b alpha_s can be obtained trivially from the knowledge of the corresponding O(alpha) correction to the positronium decay spectrum in the same region. The latter can be obtained from the NRQED computation of the orthopositronium photon spectrum, or by applying the threshold expansion to the 1-loop QED amplitude, as it is explained in this talk.

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