MUON
Lattice determination of the muon's anomalous magnetic moment
| Grant period | 2023-10-01 - 2028-09-30 |
| Funding body | European Union |
| Call number | ERC-2021-ADG |
| Grant number | 101054515 |
| Identifier | G:(EU-Grant)101054515 |
Note: On 4/7/2021 the Fermilab announced the result of a two decade long investigation to determine the magnetic moment of the muon. By tradition, data-driven theoretical methods have been used for 50 years to calculate this magnetic moment. But, interestingly, in the last 20 years growing discrepancies were noted between theoretical and experimental findings. In the literature, the result obtained by using the data-driven method is called the “consensus value" - and it is 4.2 sigma away from the combined experimental result. This 4.2-sigma discrepancy was interpreted by many physicists as a sign for new physics with a new and unknown force - and hundreds of papers appeared in the last few months to explain the 4.2-sigma tension by some form of new physics. For theoreticians this is an extremely exciting situation because even better experimental results are expected in the next 1 to 5 years, which might further increase the tension between experiment and theory. I propose a completely different and much more fundamental theoretical approach: lattice Quantum Chromodynamics (QCD). Within this new approach I can reach better accuracies than those of the traditional approach. Furthermore, my innovative approach uses far less experimental inputs, reducing the effects of uncertainties associated with input. The objective of the present application is to show unambiguously that either (a) there is no new force, that the experimental results are actually in agreement with the Standard Model of particle physics or (b) confirm the existence of new physics with a high confidence level. To that end a very large-scale lattice Quantum Chromodynamics approach will be applied using supercomputers to yield the muon's magnetic moment with the unprecedented precision of 10(up-10) level of accuracy. The success of this project will open a new window for high precision lattice Quantum Chromodynamics and put a final word on the two decade old mystery around the muon's magnetic moment.
Recent Publications
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Conference Presentation (Plenary/Keynote)
Giusti, D. (Corresponding author)FZJ*
The HVP contribution to the muon g-2 from the lattice
2025Workshop on Flavor Changing and Conserving Processes, FCCP2025, AnacapriAnacapri, Italy, 29 Sep 2025 - 1 Oct 20252025-09-292025-10-01
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Conference Presentation (Invited)
Giusti, D. (Corresponding author)FZJ*
Hadronic vacuum polarisation contribution to the muon anomaly from first principles to an accuracy of 4.6 per mil
20249th Symposium on Prospects in the Physics of Discrete Symmetries, DISCRETE 2024, LjubljanaLjubljana, Slovenia, 2 Dec 2024 - 6 Dec 20242024-12-022024-12-06
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Talk (non-conference) (Other)
Giusti, D. (Corresponding author)FZJ*
Study of radiative leptonic decays from first principles
2024Lattice Coffee Seminar, CERNCERN, Switzerland, 19 Nov 20242024-11-19
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Conference Presentation (Other)
Giusti, D. (Corresponding author)FZJ*
Status of the HVP contribution to the muon $g - 2$ from lattice
2024III Workshop on Muon Precision Physics, LiverpoolLiverpool, UK, 12 Nov 2024 - 14 Nov 20242024-11-122024-11-14
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Conference Presentation (Other)
Giusti, D. (Corresponding author)FZJ*
Radiative leptonic decays
2024Isospin-Breaking Effects on Precision Observables in Lattice QCD, MainzMainz, Germany, 22 Jul 2024 - 26 Jul 20242024-07-222024-07-26
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Conference Presentation (Invited)
Giusti, D. (Corresponding author)FZJ*
An overview of Lattice QCD+QED progress for the HVP contribution to the muon $g - 2$
2024The Evaluation of the Leading Hadronic Contribution to the Muon g−2: Consolidation of the MUonE Experiment and Recent Developments in Low Energy e+e− Data, MainzMainz, Germany, 3 Jun 2024 - 7 Jun 20242024-06-032024-06-07
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All known publications ...
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