Test of CPT symmetry in CP-violating B decays.

Considering that the existing experimental limit for CPT violation is still poor, we explore various possible ways to test CPT symmetry in CP -violating B decays at e+e− B factories. We find that it is difficult to distinguish between the effect of direct CP violation and that of CPT violation in the time-integrated measurements of neutral B decays to CP eigenstates such as ψKS and π +π−. Instead, a cleaner signal of small CPT violation may appear in the time-integrated CP asymmetries for a few non-CP -eigenstate channels, e.g., B0 d/B̄ 0 d → D±π∓ and (−) D KS . The timedependent measurements of CP asymmetries are available, in principle, to limit the size of CPT -violating effects in neutral B-meson decays. PACS numbers: 11.30.Er, 13.25.Hw, 14.40.Nd