A Comprehensive Analysis of Polarized \(\gamma \)-ray Beam Data with the HARPO Demonstrator

We investigate the feasibility of gaseous TPC as a telescope and a polarimeterfor cosmic gamma-rays, focussing on the energy range from 1 to 100 MeV. Our beam results show the angular resolutioncan reach a factor of 2 better than that of the Fermi LAT. We also demonstrate polarimetrywith a high significance and an excellent dilution factor, for the first time above the pair productionthreshold and below 1 GeV.