Measurement of the positive muon anomalous magnetic moment to 127 ppb

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Abstract
A new measurement of the magnetic anomaly a μ of the positive muon is presented based on data taken from 2020 to 2023 by the Muon g − 2 Experiment at Fermi National Accelerator Laboratory (FNAL). This dataset contains over 2.5 times the total statistics of our previous results. From the ratio of the precession frequencies for muons and protons in our storage ring magnetic field, together with precisely known ratios of fundamental constants, we determine a μ = 1 165 920 710 ( 162 ) × 10 − 12 (139 ppb) for the new datasets, and a μ = 1 165 920 705 ( 148 ) × 10 − 12 (127 ppb) when combined with our previous results. The new experimental world average, dominated by the measurements at FNAL, is a μ ( exp ) = 1 165 920 715 ( 145 ) × 10 − 12 (124 ppb). The measurements at FNAL have improved the precision on the world average by over a factor of 4.
Funding Information
  • Fermilab (89243024CSC000002)
  • U.S. Department of Energy
  • High Energy Physics
  • Nuclear Physics
  • Advanced Scientific Computing Research
  • National Science Foundation
  • Istituto Nazionale di Fisica Nucleare
  • Science and Technology Facilities Council
  • Royal Society
  • National Natural Science Foundation of China (12475108)
  • National Natural Science Foundation of China (12305217)
  • National Natural Science Foundation of China (12075151)
  • Ministry of Science, ICT and Future Planning
  • National Research Foundation of Korea
  • Institute for Basic Science (R017-D1)
  • Deutsche Forschungsgemeinschaft (39083149)
  • HORIZON EUROPE Marie Sklodowska-Curie Actions (101006726)
  • HORIZON EUROPE Marie Sklodowska-Curie Actions (734303)
  • European Commission (824093)
  • Leverhulme Trust (LIP-2021-014)

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