Isospin Violation and the Magnetic Moment of the Muon
Abstract
We calculate the leading isospin-violating and electromagnetic corrections for the decay tau -> pi0 pi nutau at low energies. The corrections are small but relevant for the inclusion of tau decay data in the determination of hadronic vacuum polarization especially for the anomalous magnetic moment of the muon. We show that part of the systematic differences between the measured form factors in tau -> pi0 pi nutau and e+ e- -> pi+ pi- is due to isospin violation .
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