Improved measurement of [Formula presented]

Using a sample of [Formula presented] events collected with the BESIII detector, an improved measurement of the decay [Formula presented], with [Formula presented] and [Formula presented] is performed. The branching fraction is determined to be [Formula presented], where the first uncertainty is statistical and the second is systematic. This result is consistent with the previous measurement and is obtained with significantly improved precision. Furthermore, the first measurement of the transition form factor cutoff parameter for this decay is reported, with [Formula presented]. These measurements provide valuable input for understanding the internal structure of the [Formula presented] meson and testing theoretical models.