2014/07/10 by Thomas Blum, Saumitra Chowdhury, Masashi Hayakawa +1 · 1 citation
Physics and Astronomy · #hep-lat #hep-ph
paper · pdf · doi:10.1103/physrevlett.114.012001
published as Phys. Rev. Lett. 114, 012001 (2015) · 5 pages, 5 figures
arxiv created 2014/07/10 · arxiv updated 2015/01/14
The form factor that yields the light-by-light scattering contribution to the muon anomalous magnetic moment is computed in lattice QCD+QED and QED. A non-perturbative treatment of QED is used and is checked against perturbation theory. The hadronic contribution is calculated for unphysical quark and muon masses, and only the diagram with a single quark loop is computed. Statistically significant signals are obtained. Initial results appear promising, and the prospect for a complete calculation with physical masses and controlled errors is discussed.