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Davier, M.; Hoecker, A.; Malaescu, B.; Zhang, Z.
The European physical journal. C, Particles and fields, 12/2017, Letnik: 77, Številka: 12Journal Article
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 - → 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 ± 3.4 ) × 10 - 10 , improving the precision of our previous evaluation by 21%. The full Standard Model prediction differs by 3.5 σ from the experimental value. The five-quark hadronic contribution to α ( m Z 2 ) is evaluated to be ( 276.0 ± 0.9 ) × 10 - 4 .
