Measurement of the asymmetry parameter for the decay $\barΛ\to \bar pπ^+$

Details Measurement of the asymmetry parameter for the decay $\barΛ\to \bar pπ^+$ Measurement of the asymmetry parameter for the decay $\barΛ\to \bar pπ^+$

2009-11-16

arxiv.org/abs/0911.2972v3

Phys.Rev.D81:012003,2010

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages, 5 figures, 2 tables

Scientific paper

10.1103/PhysRevD.81.012003

Based on a sample of $58\times10^6J/\psi$ decays collected with the BESII detector at the BEPC, the $\bar\Lambda$ decay parameter $\alpha_{\bar\Lambda}$ for $\bar\Lambda\to \bar p \pi^+$ is measured using about 9000 $J/\psi\to\Lambda\bar\Lambda\to p \bar p \pi^+\pi^-$ decays. A fit to the joint angular distributions yields $\alpha_{\bar\Lambda}(\bar\Lambda\to \bar p\pi^+)=-0.755\pm0.083\pm0.063$, where the first error is statistical, and the second systematic.

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