CP symmetry tests in the cascade-anticascade decay of charmonium
英文摘要：
We analyze joint angular distributions of a charmonium decay to the $Ξ\barΞ$ pair using the $Ξ\toΛπ\to pπ^-π$ weak decay chain for the cascade and the charge conjugated mode for the anticascade. The decays allow a direct comparison of the baryon and antibaryon decay properties and a sensitive test of CP symmetry in the strange baryon sector. We show that all involved decay parameters can be determined separately in vector and (pseudo)scalar charmonia decays into $Ξ\barΞ$ due to the spin correlations between the weak decay chains. Contrary to the recently measured $e^+e^-\to J/ψ\to Λ\barΛ$ process, the transverse polarization of the cascade is not needed and has almost no impact on the uncertainties of the decay parameters.
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