More about excited bottomonium radiative decays
arXiv:1207.3825 · doi:10.1103/PhysRevD.86.057501
Abstract
Radiative decays of bottomonium are revisited, focusing on contributions from higher-order relativistic effects. The leading relativistic correction to the magnetic spin-flip operator at the photon vertex is found to be particularly important. The combination of O(v^6) effects in the nonrelativistic QCD action and in the transition operator moves previous lattice results for excited Upsilon decays into agreement with experiment.
4 pages, 3 figures, published version