Abstract
Using the largest [Formula: see text] and [Formula: see text] data samples in the world, BESIII has measured some charmonium electromagnetic Dalitz decays. Stimulated by the recent experimental results from BESIII, we study the electromagnetic Dalitz decays of [Formula: see text] and [Formula: see text], based on the pointlike QED theory and the simple pole approximation theory, and we present the numerical values of the branching fractions. With the available large samples of [Formula: see text] and [Formula: see text] events collected with the BESIII detector, the expected events for these electromagnetic Dalitz decays are estimated, which offers a unique opportunity to check the theoretical predictions and to measure the transition form factor (TFF). The TFF could characterize the electromagnetic structure arising at the vertex of the transition, and serve as a sensitive probe to the internal structures. These results could be useful for the data taking plan in the future at BESIII.
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