More about excited bottomonium radiative decays [PDF]
Randy Lewis, R. M. WoloshynRadiative 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 NRQCD action and in the transition operator moves previous lattice results for excited Upsilon decays into agreement with experiment.View original: http://arxiv.org/abs/1207.3825
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