Radiative tau decay and the magnetic moment of the muon

Details Radiative tau decay and the magnetic moment of the muon Radiative tau decay and the magnetic moment of the muon

2002-07-25

arxiv.org/abs/hep-ph/0207310v2

JHEP 0208 (2002) 002

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages, 6 figures

Scientific paper

10.1088/1126-6708/2002/08/002

We discuss the decay tau^- -> nu_tau pi^- pi^0 gamma in terms of a model with the correct low-energy structure and with the relevant resonance degress of freedom. The nontrivial radiative dynamics becomes visible for large photon momenta only. We use the model to calculate electromagnetic corrections for the two-pion contribution to hadronic vacuum polarization extracted from photon-inclusive two-pion decays. The corrections are insensitive to the details of the model and depend on the pion form factor only. Putting all relevant isospin violating corrections together, we obtain a shift Delta a_mu = (- 120 +/- 26 +/- 3) x 10^-11 to be applied to determinations of the anomalous magnetic moment of the muon from photon-inclusive tau data.

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