Recent results with heavy quarks and light lepton bound states
Andrzej Czarnecki, Kirill Melnikov, Alexander Yelkhovsky
Abstract
Recent results on second order quantum corrections to semileptonic decays of b quarks and positronium spectroscopy are reviewed. Similarities between calculations in these seemingly different problems are demonstrated. Technical aspects of solving systems of recurrence relations, and application of dimensional regularization to bound states are explained.
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