Abstract
Abstract Recent experiments show that the isospin-violating mass splitting of the B mesons is very small, but the best fits with a QCD sum rule analysis give a splitting of at least 1.0 MeV. The isospin-violating mass splittings of the charmed mesons, on the other hand, are in agreement with experiment. In this letter we show that the inclusion of 2 nd kind QED penguin diagrams can account for this discrepancy within the errors in the QCD sum rule method.
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