A Measurement of the Decay Asymmetry Parameters in $Ξ_{c}^{0}\to \X^{-}π^{+}$

Details A Measurement of the Decay Asymmetry Parameters in $Ξ_{c}^{0}\to \X^{-}π^{+}$ A Measurement of the Decay Asymmetry Parameters in $Ξ_{c}^{0}\to \X^{-}π^{+}$

2000-11-21

arxiv.org/abs/hep-ex/0011073v1

Phys.Rev.D63:111102,2001

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS

Scientific paper

10.1103/PhysRevD.63.111102

Using the CLEO II detector at the Cornell Electron Storage Ring we have measured the $\Xi_c^{0}$ decay asymmetry parameter in the decay $\Xi_c^{0} \to \Xi^{-} \pi^+$. We find $\alpha_{\Xi_c^{0}} \alpha_{\Xi} = 0.26 \pm 0.18{(stat)}^{+0.05}_{-0.04}{(syst)}$, using the world average value of $\alpha_{\Xi} = -0.456 \pm 0.014$ we obtain $\alpha_{\Xi_c^{0}} = -0.56 \pm 0.39{(stat)}^{+0.10}_{-0.09}{(syst)}$. The physically allowed range of a decay asymmetry parameter is $-1<\alpha<+1$. Our result prefers a negative value: $\alpha_{\Xi_c^{0}}$ is $<0.1$ at the 90% CL. The central value occupies the middle of the theoretically expected range but is not yet precise enough to choose between models.

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