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Physical Review Letters – 24 January 2003
Volume 90, Issue 3

Calculated photon spectra for the decay Υ→XƔ using a nonrelativistic QCD approach and soft-collinear effective theory (dashed line) plus "resummation" effects (solid line). The shaded areas indicate the theoretical uncertainties. Shown for comparison are experimental data from the CLEO Collaboration. [Sean Fleming and Adam K. Leibovich, Phys. Rev. Lett. 90, 032001 (2003)]

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