Measurements of psi(2S) decays to octet baryon-antibaryon pairs

Abstract

With a sample of 14 million psi(2S) events collected by the BESII detector at the Beijing Electron Positron Collider (BEPC), the decay channels psi(2S)->p p-bar, Lambda Lambda-bar, Sigma0 Sigma0-bar, Xi Xi-bar are measured, and their branching ratios are determined to be (3.36+-0.09+-0.24)*10E-4, (3.39+-0.20+-0.32)*10E-4, (2.35+-0.36+-0.32)*10E-4, (3.03+-0.40+-0.32)*10E-4, respectively. In the decay psi(2S)->p p-bar, the angular distribution parameter alpha is determined to be 0.82+-0.17+-0.04.

8 pages, 8 figures

References in corpus (10)

• The Cosmological Parameters 2006
• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• BESII Detector Simulation
• Measurement of the Branching Fraction of J/psi --> pi+ pi- pi0
• Branching Fraction Measurements of psi(2S) Decay to Baryon-Antibaryon Final States
• Study of J/psi decays to Lambda Lambdabar and Sigma0 Sigma0bar
• Measurements of J/psi --> p \bar{p}
• Measurement of the angular distribution in $\bar{p}p\to \psi (2S)\to e^{+}{e}^{-}$
• Measurement of $\psi (2S)$ decays to baryon pairs
• Measurement of the branching fractions of psi(2S) -> 3(pi+pi-) and J/psi -> 2(pi+pi-)

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• Study of $J/\psi$ and $\psi (3686)$ decay to $\Lambda \bar{\Lambda }$ and ${\Sigma }^0{\bar{\Sigma }}^0$ final states
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• First measurements of J/Psi decays into ${\Sigma }^{+}{\bar{\Sigma }}^{-}$ and ${\Xi }^0{\bar{\Xi }}^0$
• Observation of $\psi (3686)\to n\bar{n}$ and improved measurement of $\psi (3686)\to p\bar{p}$
• Evidence for a J/psi-ppbar Pauli Strong Coupling ?
• Measurements of the branching fractions of $\psi (3686)\to {\bar{\Sigma }}^0\Lambda +c.c.$ and ${\chi }_{cJ(J=0,1,2)}\to \Lambda \bar{\Lambda }$
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