arXiv subjects
Publications and source records attributed to Xiao-Gang He.
We study CP violation in fermion pair decays of Higgs boson. We idenfy some CP odd observables related to the tree level decay amplitude. We find that a few thousand Higgs boson decay events can already provide important information about CP violation. If the Higgs boson is produced, such an analysis could be carried out at the SSC, LHC and NLC.
We study CP violation in $J/ψ\rightarrow Λ\barΛ$ decay. This decay provides a good place to look for CP violation. Some observables are very sensitive to the $Λ$ electric dipole moment $d_Λ$ and therefore can be used to improve the experimental upper bound on $d_Λ$. CP violations in the lepton pair decays of $J/ψ$ and $Υ$ are also discussed.
In this paper we study the neutron electric dipole moment (EDM) due to Higgs boson exchange in Left-Right symmetric models. In pseudo-manifest Left-Right symmetric models, the neutral Higgs contribution is smaller than that from the charged Higgs. The charged Higgs contribution at the two loop level can be as large as the experimental upper bound. In non (pseudo) manifest Left-Right symmteric models, the neutral Higgs exchange contribution can reach the experimental upper bound. The Higgs exchange contributions can be more important than the ones from W-boson exchange due to $W_L - W_R$ mixing.
We show that there is an anologous Aharonov-Casher effect on a neutral particle with electric dipole moment interacting with a magnetic filed produced by magnetic monopoles.