Abstract
The three neutral pseudoscalar mesons, pi^0, eta and eta', represent one of the most interesting systems in strong interaction physics. A study of the electromagnetic properties of these mesons provides a sensitive probe of the symmetry structure of QCD at low energy. A comprehensive 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 pi^0, eta and eta' via the Primakoff effect. The completed experiments on the pi^0 radiative decay width at Jlab 6 GeV, and other planned measurements at Jlab 12 GeV will provide a rich laboratory to test the chiral anomaly and to study the origin and dynamics of chiral symmetry breaking at the confinement scale of QCD.
Highlights
The symmetries of QCD at low energy are manifested in their most unambiguous form in the sector of light pseudoscalar mesons 0, and
A study of the electromagnetic properties of these mesons provides a sensitive probe of the symmetry structure of QCD at low energy
The completed experiments on the 0 radiative decay width at Jefferson Laboratory (Jlab) 6 GeV, and other planned measurements at Jlab 12 GeV will provide a rich laboratory to test the chiral anomaly and to study the origin and dynamics of chiral symmetry breaking at the confinement scale of QCD
Summary
The symmetries of QCD at low energy are manifested in their most unambiguous form in the sector of light pseudoscalar mesons 0, and. There is a second type of axial anomaly driving the two-photon decays of 0, and. This system harbors fundamental information about the effects of SU(3) symmetry and the mixing phenomena of the mesons due to isospin and SU(3) symmetry breaking. A comprehensive Primakoff experimental program has been developed by the PrimEx collaboration in the last decade at Jlab to measure the two photon decay widths, , and the transition form factors, F ∗ , of 0, , and [1, 2]. The transition form factors of these mesons in the low Q2 (0.001—0.5 GeV2/c2) region will be measured at 12 GeV as well
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