First Evidence of Lambda Lambda-bar in χ_cJ Decays

Details First Evidence of Lambda Lambda-bar in χ_cJ Decays First Evidence of Lambda Lambda-bar in χ_cJ Decays

2003-04-07

arxiv.org/abs/hep-ex/0304012v1

Phys.Rev.D67:112001,2003

Physics

High Energy Physics

High Energy Physics - Experiment

18 pages, 8 figures, submitted to Phys. Rev. D

Scientific paper

10.1103/PhysRevD.67.112001

The first observation of \chi_cJ (J=0,1,2) decays to Lambda Lambda-bar is reported using \psi(2S) data collected with the BESII detector at the BEPC. The branching ratios are determined to be BR(\chi_c0 \to Lambda Lambda-bar) = (4.7^{+1.3}_{-1.2} \pm 1.0)\times 10^{-4}, BR(\chi_c1 \to Lambda Lambda-bar) = (2.6^{+1.0}_{-0.9} \pm 0.6)\times 10^{-4} and BR(\chi_c2 \to Lambda Lambda-bar) = (3.3^{+1.5}_{-1.3} \pm 0.7)\times 10^{-4}. Results are compared with model predictions.

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