Abstract
Using a data sample corresponding to an integrated luminosity of recorded by the BESIII detector at a center-of-mass energy of 3.773 GeV, we present an analysis of the decays and . By performing a partial wave analysis, the -wave contribution to is observed to be with a statistical significance greater than , besides the dominant -wave contribution. This is the first observation of the -wave contribution. We measure the branching fractions , , and . An upper limit of is set at the 90% confidence level. We also obtain the hadronic form factor ratios of at assuming the single-pole dominance parametrization: , .
- Received 19 September 2018
- Revised 3 January 2019
DOI:https://doi.org/10.1103/PhysRevLett.122.062001
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society