Abstract
Abstract
The decay of Higgs boson into two spin-1/2 particles provides an ideal system to reveal quantum entanglement and Bell-nonlocality. Future
colliders can improve the measurement accuracy of the spin correlation of tau lepton pairs from Higgs boson decay. We show the testability of Bell inequality through
at Circular Electron Positron Collider (CEPC). Two realistic methods of testing Bell inequality are investigated, i.e., Törnqvist's method and Clauser-Home-Shimony-Holt (CHSH) inequality. In the simulation, we consider the detector effects of CEPC including uncertainties for tracks and jets from Z boson in the production of
. Necessary reconstruction approaches are described to measure quantum entanglement between
and
. Finally, we show the sensitivity of CEPC to Bell inequality violation for the two methods.
Funder
the Fundamental Research Funds for the Central Universities, Nankai University
Innovation Capability Support Program of Shaanxi
National Natural Science Foundation of China