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Light Meson decays provide a unique laboratory to probe fundamental QCD symmetries and to search for new physics beyond the Standard Model. A comprehensive Primakoff experimental program at Jefferson Laboratory (Jlab) is aimed at gathering high precision measurements on the two-photon decay widths and transition form factors at low Q 2 of π 0 , η and η  via the Primakoff effect. Completed experiments on the π 0 radiative decay width at Jlab 6 GeV, and planned measurements of η and η  at Jlab 12 GeV will provide sensitive probes to test the chiral anomaly and to study the origin and dynamics of chiral symmetry breaking. On the other hand, a recently developed Jlab Eta Factory (JEF) experiment will measure various η decays with emphasis on rare neutral modes. Compared to all other existing or planned experiments in the world, the JEF experiment offers a clean data set for rare η decays to neutral modes with a factor of two orders of magnitude reduction in backgrounds. These results will offer sensitive hadronic probes for weakly-coupled new forces, such as a dark force via a leptophobic dark V B-boson or a new C-violating, P-conserving force. An overview of these experimental activities and their physics impacts will be discussed.

Probes for fundamental QCD symmetries and a dark gauge boson via light meson decays