[Theory-seminars] REMiNDER: Theory Seminar, Wednesday Dec 13, 2:00pm, Room ***L102*** - Peter Stoffer

[Alessandro Pilloni]

Hi everybody,
the seminar has been moved to L102

Alessandro



On Dec 12, 2017, at 1:49 PM, Alessandro Pilloni <pillaus at jlab.org> wrote:

> Theory Center Seminar
> Wednesday, Dec. 13, 2017
> 2:00 p.m. (coffee at 1:45 p.m.)
> CEBAF Center, Room ***L102***
> 
> Peter Stoffer (UCSD)
> 
> Dispersion relation for hadronic light-by-light scattering
> 
> The anomalous magnetic moment of the muon g-2 has been measured and computed to very high precision of about 0.5 ppm. For more than a decade, a discrepancy has persisted between experiment and Standard Model prediction, now of about 3-4 sigma. The main uncertainty of the theory prediction is due to strong interaction effects. With improved input for hadronic vacuum polarisation, the subleading hadronic light-by-light (HLbL) contribution starts to dominate the theory error. While some constraints from QCD exist, the calculation of the HLbL contribution to g-2 is plagued by a substantial model dependence. In this talk, I will present a dispersive approach to HLbL scattering, based on the fundamental principles of unitarity and analyticity. Our dispersive formalism recently allowed us to evaluate two-pion contributions including rescattering effects and it shows a path towards a data-driven determination of the HLbL contribution to g-2 of the muon.
> 
> 
> 
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