The branching ratio for inclusive ψ production in ψ(1S) decays is measured to be (0.11 ± 0.04 ± 0.02)%.
Bibliographical noteFunding Information:
We acknowledge the assistance of Matthew Craig, who performed some of the early data analysis. We are grateful for the efforts of the CESR staff. R. Kass wishes to thank the OJI program of the DOE for support. P.S.D. is grateful for support from the PYI program of the NSF. R.P. thanks the A.P. Sloan Foundation for support. This work was supported by the National Science Foundation and by the U.S. Department of Energy under contract numbers DE-AC02-76ER01428, DE-AC02-76ER03066, DE-AC02-76ER03064, DE-AC02-76ER01545, DE-AC02-76ER05011 and FG05-86-ER40272. The Cornell National Supercomputing Facility, funded by the NSF, New York State, and IBM, was used in this research.