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Update on the hadronic vacuum polarisation contributions to muon g − 2 and α(mZ2).
- Source :
-
EPJ Web of Conferences . 10/18/2019, Vol. 218, p1-4. 4p. - Publication Year :
- 2019
-
Abstract
- An update of the hadronic vacuum polarisation contributions to the muon magnetic anomaly and to the running of the electromagnetic couplings constant at the Z-boson mass is presented. Newest e+e−→ hadrons cross-section data mainly from the BABAR and VEPP-2000 experiments have been included. For the muon (g−2)/2, the lowest-order hadronic contribution is evaluated to be (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) $ \alpha (\mathop m\nolimits_z^2) $ is evaluated to be (276.0 ± 0.9) · 10−4. [ABSTRACT FROM AUTHOR]
- Subjects :
- *VACUUM polarization
*MUONS
*MAGNETIC anomalies
*ELECTROMAGNETIC coupling
*BOSONS
Subjects
Details
- Language :
- English
- ISSN :
- 21016275
- Volume :
- 218
- Database :
- Academic Search Index
- Journal :
- EPJ Web of Conferences
- Publication Type :
- Conference
- Accession number :
- 139291875
- Full Text :
- https://doi.org/10.1051/epjconf/201921801002