Suppressed $B \to PV $ CP asymmetry: CPT constraint

Understand

Charge Parity asymmetry in charmless B meson decays is a key issue to be understood.

• Many theoretical calculations have been performed using short distance factorization approaches which, in general, do not take into account the CPT invariance constraint.
• For each channel with CP violation there is an equal amount of CP asymmetry in another channel or other channels, with an opposite sign.
• This happens if these channels are coupled through final state interactions (FSI).