用J/ψ \to Λ$衰变研究量子相干$Λ\Lambdabar$态的$Λ- \Lambdabar$振荡
Study of $Λ- \Lambdabar$ Oscillation in quantum coherent $Λ\Lambdabar$ state by using J/ψ\to Λ\barΛ$ decay
摘要：
讨论了在J/ $ψ\to \Lam \Lamb$衰变过程中寻找$\Lam\Lamb$振荡的可能性。本文讨论了在北京谱仪-Ⅲ实验中测量$\Lam -\Lamb$振荡的灵敏度问题。这些考虑表明，除了中子振荡实验，探测$ΔB =2$振幅的另一种方法。相干信息和时间相关信息都可用于提取$\Lam-\Lamb$振荡参数。在90%的置信水平下，利用BES-Ⅲ一年的光度，我们可以设定一个$δm_{\Lam \Lamb} < 10^{-15}$ MeV的上限值，相当于$\Lam-\Lamb$振荡时间的约s。
英文摘要：
We discuss the possibility of searching for the $\Lam - \Lamb$ oscillations for coherent $\Lam\Lamb$ production in the J/$ψ\to \Lam \Lamb$ decay process. The sensitivity of measurement of $\Lam -\Lamb$ oscillation in the external field at BES-III experiment is considered. These considerations indicate an alternative way to probe the $ΔB =2$ amplitude in addition to neutron oscillation experiments. Both coherent and time-dependent information can be used to extract the $\Lam-\Lamb$ oscillation parameter. With one year's luminosity at BES-III, we can set an upper limit of $δm_{\Lam \Lamb} < 10^{-15}$ MeV at 90% confidence level, corresponding to about $10^{-6}$ s of $\Lam-\Lamb$ oscillation time.
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