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The role of sigma_hadronic for the future of the precision determinations of the muon g-2 and the running alpha_em

ECT* Colloquium
Fred Jegerlehner (DESY Zeuthen, Humboldt Univ. Berlin)
12 Apr 2013 - 10:00
Villa Tambosi 2nd Floor, Seminar Room

Precision measurements of hadronic cross-sections in electron-positron annihilation play a key role in high precision predictions of the muon anomalous magnetic moment α_\ μ and for a precise determination of the effective fine structure constant α_{\rm em}(M_Z).  The role of the effective fine structure constant for the future of high precision electroweak fits and possible progress is outlined. I present a brief summary of the status of the anomalous magnetic moment of the muon and then discuss the requirements for the next generation experiments. The hope is to be able to substantially enhance the significance of known ``deviations'' between SM predictions and experiments, and eventially establish new physics not yet included in the Standar Model.