First Evidence of Lambda Lambda-bar in χ_cJ Decays

Abstract

The first observation of χ_cJ (J=0,1,2) decays to Lambda Lambda-bar is reported using ψ(2S) data collected with the BESII detector at the BEPC. The branching ratios are determined to be BR(χ_c0 \to Lambda Lambda-bar) = (4.7^{+1.3}_{-1.2} \pm 1.0)\times 10^{-4}, BR(χ_c1 \to Lambda Lambda-bar) = (2.6^{+1.0}_{-0.9} \pm 0.6)\times 10^{-4} and BR(χ_c2 \to Lambda Lambda-bar) = (3.3^{+1.5}_{-1.3} \pm 0.7)\times 10^{-4}. Results are compared with model predictions.

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

References in corpus (1)

• A Measurement of Psi(2S) Resonance Parameters

Cited by in corpus (9)

• ψ(2S) Decays into $\J$ plus Two Photons
• Measurements of Baryon Pair Decays of ${\chi }_{cJ}$ Mesons
• Exclusive Baryon-Antibaryon Decays of the chi_cJ Mesons
• Observation of χ_{cJ} decaying into the p\bar{p}K^{+}K^{-} final state
• Observation of $K^{\ast }(892{)}^0{\bar{K}}^{\ast }(892{)}^0$ in ${\chi }_{cJ}$ Decays
• Measurement of chi_cJ Decays to 2(pi^+pi^-)ppbar Final States
• First observations of $\psi (2S)$ and ${\chi }_{cJ}(1P)$ decays to four-body final states $h^{+}{h}^{-}{K}_S^0{K}_S^0$
• Determination of BR(chi_{cJ} --> p \bar{p}) in psi(2S) decays
• Hadronic decays of charmonia from BESII