New Measurements of Upsilon(1S) Decays to Charmonium Final States

Details New Measurements of Upsilon(1S) Decays to Charmonium Final States New Measurements of Upsilon(1S) Decays to Charmonium Final States

2004-07-16

arxiv.org/abs/hep-ex/0407030v2

Phys.Rev.D70:072001,2004

Physics

High Energy Physics

High Energy Physics - Experiment

27 pages postscript,also available through http://w4.lns.cornell.edu/public/CLNS/, submitted to PRD

Scientific paper

10.1103/PhysRevD.70.072001

Using substantially larger data samples collected by the CLEO III detector, we report on new measurements of the decays of Upsilon(1S) to charmonium final states, including J/Psi, psi(2S), and chi_cJ. The latter two are first observations of these decays. We measure the branching fractions as follows: B(Y(1S)--> J/Psi+X)=(6.4+-0.4+-0.6)x10^-4, B(Y(1S)--> psi(2S)+X)/B(Y(1S)--> J/Psi+X)=0.41+-0.11+-0.08, B(Y(1S)--> chi_c1+X)/B(Y(1S)--> J/Psi+X)=0.35+-0.08+-0.06, B(Y(1S)--> chi_c2+X)/B(Y(1S)--> J/Psi+X)=0.52+-0.12+-0.09, and B(Y(1S)--> chi_c0+X)/B(Y(1S)--> J/Psi+X)<7.4% at 90% confidence level. We also report on the momentum and angular spectra of J/Psi's in Upsilon(1S) decay. The results are compared to predictions of the color octet and color singlet models.

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