Abstract
The U (1) axial-vector form factor is studied using an unsubtracted dispersion relation. The associated axial charge is shown to be analytic in quark masses in the chiral limit although individual terms in the Cheng-Li separation exhibit large isospin and flavor-SU (3) symmetry breaking. A new separation of the U (1) axial charge is proposed, based on the wave functions of the physical states entering in the spectral density
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