Speaker
Description
The Muon g-2 collaboration has published the most precise measurement of the muon anomalous magnetic moment a? with an uncertainty of 460 ppb in 2021. The new experimental world average of a? deviates by 4.2 standard deviations from the Standard Model prediction provided by the Muon g-2 Theory Initiative. The emerging results from ab-initio lattice QCD calculations allow scrutiny of this tantalizing hint for physics beyond the Standard Model for the first time in a three way comparison. To extract the value of a? at Muon g-2, a clock comparison experiment is performed with spin-polarized muons confined vertically with electric fields in a superbly controlled magnetic field environment. The anomalous spin precession frequency, defined as the deviation of the spin precession frequency from the cyclotron frequency, is determined while a high-precision measurement of the magnetic field is performed using nuclear magnetic resonance techniques. This contribution will present the multi-step measurement and analysis of the high-precision magnetic field in the muon storage volume. This work is supported by the Cluster of Excellence “Precision Physics, Fundamental Interactions, and Structure of Matter” (PRISMA+ EXC 2118/1) funded by the German Research Foundation (DFG) within the German Excellence Strategy (Project ID 39083149) and the EU Horizon 2020 Research and Innovation Programme under the Marie Sklodowska-Curie Grant Agreement No. 101006726.
