Abstract
New measurements of transverse target and beam-target asymmetries in pion photo-production were performed using the Crystal Ball at the Mainz Microtron MAMI. Preliminary results are discussed in the context of model-independent partial wave analyses for pseudo-scalar meson photo-production below Ecm = 2 GeV.
Highlights
The full complexity of QCD manifests itself in the rich and multifaceted phenomena observed in meson scattering and meson production experiments at low energies
With the polarized beam and targets available at MAMI, 8observables can be measured over the full angular range: dσ dΩ = σ0
The MAMI accelerator consists of four cascaded microtrons, an injector linac, a thermal source for unpolarized electrons and a laser-driven source for electrons with 80% spin polarization
Summary
The full complexity of QCD manifests itself in the rich and multifaceted phenomena observed in meson scattering and meson production experiments at low energies. One goal of the N program at the Mainz Microtron MAMI is, to reveal this partial wave structure of pseudo-scalar meson photo-production at center of mass energies below 2 GeV with minimal model dependence. Measurements of spin observables over a large kinematic range will allow us to disentangle the interference structure of amplitudes. This will provide valuable constraints to coupled channel calculations and is a prerequisite for a reliable determination of universal resonance parameters which can be compared to quark models, lattice calculations or similar phenomena in different environments like pp scattering or J/Ψ decays. I will outline the strategy to extract the partial wave amplitudes, describe the Crystal Ball experiment at MAMI and discuss preliminary results for the γp → π0p reaction
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