Abstract
Based on a sample of 1.31 billion events collected with the BESIII detector, we report the study of the doubly radiative decay for the first time, where the meson is produced via the decay. The branching fraction of inclusive decay is measured to be , while the branching fractions of the dominant process and the nonresonant component are determined to be and , respectively. In addition, the -dependent partial widths of the inclusive decay are also presented.
- Received 20 December 2016
DOI:https://doi.org/10.1103/PhysRevD.96.012005
© 2017 American Physical Society