Testing the Standard Model at 0.37 ppm precision using the muon anomalous magnetic moment and lattice QCD

ORAL

Abstract

The Standard Model has been remarkably successful in describing subatomic phenomena for the past five decades. However, recent measurements of the muon's anomalous magnetic moment (aμ​) show a notable deviation from the reference Standard Model's prediction, potentially pointing to new fundamental physics. I will present a lattice QCD calculation of the contribution that currently limits the precision of the Standard Model's prediction for aμ​. Combing the result of this calculation with other known contributions leads to a theoretical prediction that differs from the current experimental world average by only 0.9 standard deviations, within a total uncertainty of 0.37 ppm.

*The authors gratefully acknowledge the Gauss Centre for Supercomputing (GCS) e.V., GENCI (grant 502275) and EuroHPC Joint Undertaking (grant EXT-2023E02-063) for providing computer time on the GCS supercomputers SuperMUC-NG at Leibniz Supercomputing Centre in München, HAWK at the High Performance Computing Center in Stuttgart and JUWELS and JURECA at Forschungszentrum Jülich, as well as on the GENCI supercomputers Joliot-Curie Irène Rome at TGCC, Jean-Zay V100 at IDRIS, Adastra at CINES and on the Leonardo supercomputer hosted at CINECA. This work received funding from the French National Research Agency under contract ANR-22- CE31-0011, from the Excellence Initiative of Aix-Marseille University – A*Midex, a French "Investissements d'Avenir" program, under grants AMX-18-ACE-005, AMX-22-RE-AB-052, and from grants NW21-024-A and BMBF-05P21PXFCA, ERC-MUON-101054515, NW21-024-B, DOE-0000278885, UK STFC Grant ST/X000494/1 and from a long-term Invitational Fellowship L23530 from the Japan Society for the Promotion of Science.

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Publication: 2407.10913 [hep-lat]

Presenters

  • Laurent Lellouch

    • CNRS & Aix-Marseille U.

Authors

  • Laurent Lellouch

    • CNRS & Aix-Marseille U.