The recently reported new measurement of the anomalous magnetic moment of the muon, aΜ, by the E989 collaboration at Fermilab has increased the tension with the Standard Model (SM) prediction to 4.2 standard deviations. In order to increase the sensitivity of SM tests, the precision of the theoretical prediction, which is limited by the strong interaction, must be further improved. In our project we employ lattice QCD to compute the leading hadronic contributions to aΜ and various other precision observables, such as the energy dependence (“running”) of the electromagnetic coupling, α, and the electroweak mixing angle, sin2 θW. Here we report on the performance of our simulation codes used for the generation of gauge ensembles at (near-)physical pion masses and fine lattice spacings. Furthermore, we present results for the hadronic running of α, the electroweak mixing angle, as well as the hadronic vacuum polarisation and light-by-light scattering contributions to aΜ. Results from an ancillary calculation of the spectrum in the isovector channel are crucial in order to further increase the precision of our determination of the hadronic vacuum polarisation contribution.
Cè, M., Chao, E., Gérardin, A., Green, J., von Hippel, G., Hörz, B., et al. (2023). Hadronic contributions to the anomalous magnetic moment of the muon from Lattice QCD. In W.E. Nagel, D.H. Kröner, M.M. Resch (a cura di), High Performance Computing in Science and Engineering '21 Transactions of the High Performance Computing Center, Stuttgart (HLRS) 2021 (pp. 19-33). Springer International Publishing [10.1007/978-3-031-17937-2_2].
Hadronic contributions to the anomalous magnetic moment of the muon from Lattice QCD
Cè, M.;
2023
Abstract
The recently reported new measurement of the anomalous magnetic moment of the muon, aΜ, by the E989 collaboration at Fermilab has increased the tension with the Standard Model (SM) prediction to 4.2 standard deviations. In order to increase the sensitivity of SM tests, the precision of the theoretical prediction, which is limited by the strong interaction, must be further improved. In our project we employ lattice QCD to compute the leading hadronic contributions to aΜ and various other precision observables, such as the energy dependence (“running”) of the electromagnetic coupling, α, and the electroweak mixing angle, sin2 θW. Here we report on the performance of our simulation codes used for the generation of gauge ensembles at (near-)physical pion masses and fine lattice spacings. Furthermore, we present results for the hadronic running of α, the electroweak mixing angle, as well as the hadronic vacuum polarisation and light-by-light scattering contributions to aΜ. Results from an ancillary calculation of the spectrum in the isovector channel are crucial in order to further increase the precision of our determination of the hadronic vacuum polarisation contribution.
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