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Massimiliano Procura (Vienna): A novel theoretical framework for a precision evaluation of the muon anomalous magnetic moment

Friday, 13. October 2017, 15:00

Location:  Ludwig-Boltzmann-Hörsaal, Boltzmanngasse 5, EG

Vortrag im Rahmen des Habilitationsverfahrens "Particle Physics"

The anomalous magnetic moment of the muon is one of the most accurately measured quantities in particle physics and one of the very few to exhibit a significant discrepancy with respect to its Standard Model determination. The origin of this discrepancy is unknown. To resolve this intriguing puzzle, new experiments have been designed with the concrete goal to improve in the next few years the already impressive accuracy of 0.54 parts per millions reached by previous measurements.

This calls for improved theory predictions. Standard Model uncertainties are dominated by virtual low-energy strong interaction effects that cannot be computed using perturbative quantum chromodynamics. In particular, the hadronic light-by-light scattering (HLbL) corrections are emerging as a potential roadblock for a more precise theoretical evaluation. In order to compute the HLbL contribution, indeed, we had to rely so far on hadronic models introducing sources of systematic errors that are difficult, if not impossible, to quantify.

I will present the basic features and numerical results of a novel framework which by exploiting the general principles of unitarity and analyticity, paves the way for the first data-driven determination of HLbL with controlled uncertainties.

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