Abstract
Using -meson pairs collected by the Belle detector at the KEKB collider, we measure branching fractions of for and for . We perform amplitude analyses to determine the resonant structure of the final state in and and find that the is a prominent component of both decay modes. There is significant interference among the different intermediate states, which leads, in particular, to a striking distortion of the line shape due to the . Based on the results of the fit to the data, the relative decay fractions of the to , , and are consistent with previous measurements, but the decay fraction to is significantly smaller. Finally, by floating the mass and width of the in an additional fit of the data, we measure a mass of and a width of for the .
20 More- Received 27 September 2010
DOI:https://doi.org/10.1103/PhysRevD.83.032005
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