paper

$I ¨ \to 3 I ¨ $ and $I ¨ I ¨ ^{0}$ transition form factor revisited

arXiv:2006.01058

Abstract

In light of recent experimental results, we revisit the dispersive analysis of the $I ¨ \to 3 I ¨ $ decay amplitude and of the $I ¨ I ¨ ^{0}$ transition form factor. Within the framework of the Khuri-Treiman equations, we show that the $I ¨ \to 3 I ¨ $ Dalitz-plot parameters obtained with a once-subtracted amplitude are in agreement with the latest experimental determination by BESIII. Furthermore, we show that at low energies the $I ¨ I ¨ ^{0}$ transition form factor obtained from our determination of the $I ¨ \to 3 I ¨ $ amplitude is consistent with the data from MAMI and NA60 experiments.

I¨→3I¨ and I¨I¨0 transition form factor revisited

Abstract

$I ¨ \to 3 I ¨ $ and $I ¨ I ¨ ^{0}$ transition form factor revisited