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外文期刊>Physical review, D
>New τ-based evaluation of the hadronic contribution to the vacuum polarization piece of the muon anomalous magnetic moment
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New τ-based evaluation of the hadronic contribution to the vacuum polarization piece of the muon anomalous magnetic moment
We revisit the isospin-breaking and electromagnetic corrections to the decay τ ? → π ? π 0 ν τ , which allow its use as input in the two-pion contribution to the (leading-order) hadronic vacuum polarization part of the muon anomalous magnetic moment. We extend a previous resonance chiral Lagrangian analysis, which included those operators saturating the next-to-leading-order chiral low-energy constants, by including the contributions appearing at the next order. As a result, we improve agreement between the two-pion tau decay and e + e ? data and reduce the discrepancy between experiment and the Standard Model prediction of a μ (using τ input) to the approximately 2 σ level.
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