摘要
The decay of Higgs boson into two spin-1/2 particles provides an ideal system to reveal quantum entanglement and Bell-nonlocality.Future e^(+)e^(-) 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 h→ττ 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 e^(+)e^(-)→Zh.Necessary reconstruction approaches are described to measure quantum entanglement between τ^(+) and τ^(-).Finally,we show the sensitivity of CEPC to Bell inequality violation for the two methods.
作者
Kai Ma
Tong Li
马凯;李佟(Faculty of Science,Xi'an University of Architecture and Technology,Xi'an 710055,China;School of Physics,Nankai University,Tianjin 300071,China)
基金
Supported by the National Natural Science Foundation of China(12375096,12035008,11975129)
"the Fundamental Research Funds for the Central Universities",Nankai University(63196013)
Kai Ma was supported by the Natural Science Basic Research Program of Shaanxi Province,China(2023-JC-YB-041)
the Innovation Capability Support Program of Shaanxi Province,China(2021KJXX-47)。
