Abstract
The cross section for between and 5.3 GeV is measured via initial state radiation using of data on and around the resonances collected with the Belle detector at KEKB. Two resonant structures at the and are observed in the invariant mass distribution. Fitting the mass spectrum with the coherent sum of two Breit-Wigner functions, one obtains and for one solution and and for the other solution, where the first errors are statistical and the second are systematic. This is the first measurement of this hadronic transition mode of these two states, and the partial widths to are found to be about 1 MeV. There is no evidence for the , , , or in the final state, and upper limits of their production rates in annihilation are determined.
- Received 28 October 2012
DOI:https://doi.org/10.1103/PhysRevD.87.051101
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