Leptonic decay of the Upsilon(1S) meson at third order in QCD
  We present the complete next-to-next-to-next-to-leading order short-distance and bound-state QCD correction to the leptonic decay rate Gamma(Upsilon(1S)->l+l-) of the lowest-lying spin-1 bottomonium state. The perturbative QCD prediction is compared to the measurement Gamma(Upsilon(1S)->e+e-)=1.340(18) keV. 
Martin Beneke, Yuichiro Kiyo, Peter Marquard, Alexander Penin, Jan   Piclum, Dirk Seidel and Matthias Steinhauser
hep-ph