JLab Eta Factory

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The JEF program aims to perform precision measurements of various η decays with emphasis on rare neutral modes. Since the production rates of η and η' are similar under the JEF experimental conditions, the same data set will offer sensitive probes for η' decays as well. Compared to all existing and planned η/η′ experiments in the world, the unique feature of the JEF program is to offer a clean data set in the rare neutral decays of η and η′ with up to two orders of magnitude reduction in the backgrounds. The JEF data will offer significant different systematics compared to the other η(′) programs.