Reevaluation of the hadronic vacuum polarisation contributions to the Standard Model predictions of the muon $g-2$ and ${\alpha (m_Z^2)}$ using newest hadronic cross-section data

Abstract : We reevaluate the hadronic vacuum polarisation contributions to the muon magnetic anomaly and to the running of the electromagnetic coupling constant at the Z-boson mass. We include newest $e^+e^- \rightarrow \mathrm{hadrons}$ cross-section data (among others) from the BABAR and VEPP-2000 experiments. For the muon $(g-2)/2$ we find for the lowest-order hadronic contribution $(693.1 \pm 3.4)\times 10^{-10}$ , improving the precision of our previous evaluation by 21%. The full Standard Model prediction differs by $3.5\,\sigma $ from the experimental value. The five-quark hadronic contribution to $\alpha (m_Z^2)$ is evaluated to be $(276.0\pm 0.9)\times 10^{-4}$ .
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Eur.Phys.J.C, 2017, 77 (12), pp.827. 〈10.1140/epjc/s10052-017-5161-6〉
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https://hal.archives-ouvertes.fr/hal-01669733
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Soumis le : jeudi 21 décembre 2017 - 00:17:10
Dernière modification le : mercredi 12 décembre 2018 - 07:55:17

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Michel Davier, Andreas Hoecker, Bogdan Malaescu, Zhiqing Zhang. Reevaluation of the hadronic vacuum polarisation contributions to the Standard Model predictions of the muon $g-2$ and ${\alpha (m_Z^2)}$ using newest hadronic cross-section data. Eur.Phys.J.C, 2017, 77 (12), pp.827. 〈10.1140/epjc/s10052-017-5161-6〉. 〈hal-01669733〉

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