Hadronic contribution to the muon g-2: a Dyson-Schwinger perspective

Details Hadronic contribution to the muon g-2: a Dyson-Schwinger perspective Hadronic contribution to the muon g-2: a Dyson-Schwinger perspective

2011-11-03

arxiv.org/abs/1111.0990v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Contribution to the proceedings of 'International school of nuclear physics, 33rd course', Erice-Sicily: 16 - 24 September 201

Scientific paper

We summarize our results for hadronic contributions to the anomalous magnetic moment of the muon ($a_\mu$), 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 $a_\mu^\mathrm{HVP}$ 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 $a_\mu^\mathrm{LBL}$ with similar accuracy. We also present results for LBL using a resonance expansion of the quark anti-quark T-matrix. Our preliminary value is $a_\mu^\mathrm{LBL}=(217 \pm 91) \times 10^{-11}$.

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