Standard Model Value for the Muon Magnetic Anomaly

Author(s):  
Kirill Melnikov ◽  
Arkady Vainshtein
2010 ◽  
Vol 66 (1-2) ◽  
pp. 127-136 ◽  
Author(s):  
M. Davier ◽  
A. Hoecker ◽  
G. López Castro ◽  
B. Malaescu ◽  
X. H. Mo ◽  
...  

2019 ◽  
Vol 218 ◽  
pp. 01002
Author(s):  
Zhiqing Zhang

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 $ \alpha (\mathop m\nolimits_z^2 ) $ is evaluated to be (276.0 ± 0.9) · 10−4.


2019 ◽  
Vol 212 ◽  
pp. 05003 ◽  
Author(s):  
Alexander Keshavarzi

The current ~ 3.5σ discrepancy between the experimental measurement and theoretical prediction of the muon magnetic anomaly, aµ, stands as a potential indication of the existence of new physics. The Muon g − 2 experiment at Fermilab is set to measure aµ with a four-fold improvement in the uncertainty with respect to previous experiment, with an aim to determine whether the g − 2 discrepancy is well established. The experiment recently completed its first physics run and a summer programme of essential upgrades, before continuing on with its experimental programme. The Run-1 data alone are expected to yield a statistical uncertainty of 350 ppb and the publication of the first result is expected in late-2019.


2020 ◽  
Author(s):  
Davide Giusti ◽  
Vittorio Lubicz ◽  
Guido Martinelli ◽  
Francesco Sanfilippo ◽  
Silvano Simula

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