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https://portal.fis.tum.de/en/publications/neutral-pion-photoproduction-at-threshold/ Neutral pion photoproduction at threshold - Technical University of Munich university of munich neutral pion photoproduction threshold technical https://mailman.jlab.org/pipermail/clas12_rgk/2019-July/000332.html [clas12_rgk] exclusive neutral pion selection neutral pion rgk exclusive selection