Abstract
We calculate the form factor for the Dalitz decay with being the SU( ) flavor singlet pseudoscalar meson. The difference among the partial widths at different can be attributed in part to the and quark mass dependences induced by the anomaly dominance. in both is well described by the single pole model . Combined with the known experimental results of the Dalitz decays , the pseudoscalar mass dependence of the pole parameter is approximated by with and . These results provide inputs for future theoretical and experimental studies on the Dalitz decays .
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