  The separation of the full hadronic WW and ZZ events is an important
benchmark for the CEPC detector design and performance evaluation. This
separation performance is determined by the intrinsic boson mass distributions,
the detector performance, and the jet confusion. The latter refers to the
uncertainties induced by the jet clustering and pairing algorithms. Using the
CEPC baseline simulation, we demonstrate that the full hadronic WW and ZZ
events can be efficiently separated. We develop an analytic method that
quantifies the impact of each component and conclude that the jet confusion
dominates the separation performance. The impacts of the initial state
radiations and the heavy flavor jets are also analyzed and confirmed to be
critical for the separation performance.
