Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 73: Fundamental Symmetries II

HK 73.3: Talk

Thursday, March 31, 2022, 17:00–17:15, HK-H9

Status report of the Fermilab Muon g–2 experiment — •René Reimann for the Muon g–2 collaboration — Institute of Physics and Excellence Cluster PRISMA+, Johannes Gutenberg University Mainz, 55099 Mainz, Germany

In spring 2021 the Muon g–2 collaboration published the most precise measurement of the anomalous magnetic moment of the muon, a_µ, with a 460 ppb uncertainty. The measurement principle is based on a clock comparison between the anomalous spin precession frequency of spin-polarized muons, which is the deviation of the Larmor- from the cyclotron-frequency, and a high-precision measurement of the magnetic field environment using nuclear magnetic resonance (NMR) techniques, expressed in terms of the (free) proton spin-precession frequency. The published results are based on the run 1 data. In the meantime a data set of about 12.5 the size of run 1 has been acquired through runs 2-4 and more high-quality data is currently recorded through run 5. In this talk I summarize the current status and focus on improvements and systematic studies that the Muon g–2 collaboration implemented. In particular, I discuss the magnetic field stability and characterization.