Simulation studies onCPandCPTviolation inBB¯mixing

A simulation study is carried out for evaluating the experimental sensitivities of the BELLE detector at KEK’s $B$ factory on $\mathrm{CP}$ and $\mathrm{CPT}$ violating effects in $B^0{B}^0$ mixing. $\mathrm{CP}$ violating effects are examined in terms of the charge asymmetries of same-sign dilepton events and single lepton events. The $\mathrm{CPT}$ violating effect is examined in terms of the time evolution of the opposite-sign dilepton events. As a by-product, it is shown that a precise extraction of the $B^0{B}^0$ mixing parameter $x_d$ and the $B$ lifetime ${\tau }_B$ is possible from the proper time distribution of the same-sign dilepton events.