Study of $Λ- \Lambdabar$ Oscillation in quantum coherent $Λ\Lambdabar$ state by using J/ψ\to Λ\barΛ$ decay

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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