Isospin Mass Differences of the $B$, $D$ and $K$

Abstract

We compute the electromagnetic mass difference for the $B$-, $D$- and $K$-mesons using QCD sum rules with double dispersion relations. For the $B$- and $D$-mesons we also compute the linear quark mass correction, whereas for the $K$ the standard soft theorems prove more powerful. The mass differences, which have not previously been computed via a double dispersion, are fully consistent with experiment, albeit with large uncertainties.

arXiv commentpp17 plus refs and 2 figures

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• Reducing Hadronic Uncertainty in Low-Energy Neutral-Current Processes