QCD Corrections to Radiative Upsilon Decays

Details QCD Corrections to Radiative Upsilon Decays QCD Corrections to Radiative Upsilon Decays

1999-04-21

arxiv.org/abs/hep-ph/9904416v1

Phys.Rev.D60:111503,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex, 8 pages, 3 figures

Scientific paper

10.1103/PhysRevD.60.111503

We have calculated the next-to-leading order perturbative QCD corrections to the photon energy spectrum in radiative Upsilon decays. The higher-order corrections significantly modify the shape of the spectrum, in particular at large photon energies, and thereby reduce the discrepancy between experimental data and previous leading-order predictions. The next-to-leading order calculation of the photon energy spectrum allows a more reliable determination of the strong coupling constant from radiative Upsilon decays by restricting the analysis to the region of the energy spectrum that can be described by NLO perturbation theory.

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