Abstract
We study the processes , , and , where the photon is radiated from the initial state. About 84 000, 8000, and 4200 fully reconstructed events, respectively, are selected from of BABAR data. The invariant mass of the hadronic final state defines the center-of-mass energy, so that the data can be compared with direct measurements of the reaction. No direct measurements exist for the or reactions, and we present an update of our previous result based on a data sample that is twice as large. Studying the structure of these events, we find contributions from a number of intermediate states and extract their cross sections. In particular, we perform a more detailed study of the reaction and confirm the presence of the resonance in the and modes. In the charmonium region, we observe the in all three final states and in several intermediate states, as well as the in some modes, and measure the corresponding products of branching fraction and electron width.
35 More- Received 15 March 2011
DOI:https://doi.org/10.1103/PhysRevD.86.012008
© 2012 American Physical Society