Abstract
The anomalous magnetic moment of the muon, aμ = (g−2)μ/2, is one of the most precisely measured observables of the Standard Model. However, its value shows a sizeable discrepancy to the Standard Model prediction. It is still under discussion whether this discrepancy is a hint for New Physics or proof of the limited understanding of strong interaction at low energies. To get a better understanding of this discrepancy, one needs to reduce the uncertainty of both, the Standard Model prediction and the direct measurement. Information on the production of pion pairs in two-photon fusion processes plays an important role in the dispersive calculation of the hadronic light-by-light scattering contribution to aμ, which is one of the two large contributions to the Standard Model predictions uncertainty. The BESIII experiment, located at the Institute of High Energy Physics in Beijing/China, offers a perfect testbed for the investigation of two-photon processes at small momentum transfers. The process e+e− → e+e−π0π0 is measured at the BESIII experiment at center-of-mass energies between 3.77 and 4.59 GeV with a total integrated luminosity of more than 13 fb−1, with more data being available in future. This presentation will discuss the current status of the analysis.
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