Isospin Violation and the Magnetic Moment of the Muon

Details Isospin Violation and the Magnetic Moment of the Muon Isospin Violation and the Magnetic Moment of the Muon

2001-04-25

arxiv.org/abs/hep-ph/0104267v2

Phys.Lett.B513:361-370,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 2 figures, minor revisions in the text, references added, version to appear in Physics Letters B

Scientific paper

10.1016/S0370-2693(01)00764-X

We calculate the leading isospin-violating and electromagnetic corrections for the decay tau -> pi^0 pi nu_tau 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 -> pi^0 pi nu_tau and e^+ e^- -> pi^+ pi^- is due to isospin violation .

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