Measurement of the Helicity Asymmetry E for the γp → π0 p reaction in the Resonance Region
Open AccessIn pursuit of resolving the missing baryon resonances problem, measurement ofthe double polarization observable E for γp → π0 p was performed using circularly polarized photons on longitudinally polarized proton targets (FROzen Spin Target experiment) at photon energies between 350 MeV and 2400 MeV. The final state particles were detected with the CEBAF Large Acceptance Spectrometer (CLAS) in Hall B at the Thomas Jefferson National Accelerator Facility (JLab). A new and unique application of deep learning algorithms was attempted in this analysis to better determine and minimize the hydrogen contamination in the collected data that occurred during the experiment. While it did not lead to a significant improvement for this particular experiment, it does show promise for future experiments under conditions optimized to take advantage of machine learning techniques. The extracted data of helicity asymmetry E is compared to the SAID, MAID, and BnGa partial-wave analyses (PWA) predictions and the experimental results from the CBELSA/TAPS experiment. In search of the baryon resonances via PWA, the newly analyzed data of polarization observable E will be included in the GW SAID database. The inclusion of this thesis’s result demonstrated promising improvements in the higher energy ranges (Eγ = [1.73, 2.37] GeV) where the experimental data was previously scarce. The current study provides more refined values of the helicity asymmetry E than previous analyses of the FROST data and is useful for testing theoretical predictions of the QCD-inspired models and Lattice QCD calculations.
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