Abstract: For a variety of precision measurements in flavour physics we need to understand strong interactions at an energy scale around 1 GeV. While the description of strong interactions is well understood at high energy where a perturbative expansion applies and at low energy where effective field theories such as Chiral Perturbation Theory for light quarks are very successful, its description in the intermediate energy region is much more problematic. In particular there is no comprehensive theory available to take resonances and their interactions systematically into account. In this lecture we show how this problem can be addressed to some extent using general properties of amplitudes relying on first principles such as unitarity, analyticity and crossing symmetry together with experimental data to successfully extrapolate the chiral perturbation results in a model-independent way in the 1 GeV region.
Emilie will present three lectures on her research. This is part 3.
Emilie is a Cluster guest. Local host: Martin Jung (Universe Cluster, TUM)