Hadronic contribution to the muon g-2: a Dyson-Schwinger perspective
arXiv:1111.0990 · doi:10.1016/j.ppnp.2012.01.029
Abstract
We summarize our results for hadronic contributions to the anomalous magnetic moment of the muon ($a_μ$), the one from hadronic vacuum-polarisation (HVP) and the light-by-light scattering contribution (LBL), obtained from the Dyson-Schwinger equations (DSE's) of QCD. In the case of HVP we find good agreement with model independent determinations from dispersion relations for $a_μ^\mathrm{HVP}$ as well as for the Adler function with deviations well below the ten percent level. From this we conclude that the DSE approach should be capable of describing $a_μ^\mathrm{LBL}$ with similar accuracy. We also present results for LBL using a resonance expansion of the quark anti-quark T-matrix. Our preliminary value is $a_μ^\mathrm{LBL}=(217 \pm 91) \times 10^{-11}$.
Contribution to the proceedings of 'International school of nuclear physics, 33rd course', Erice-Sicily: 16 - 24 September 2011