in B 0 ( t ) → hyperon + antihyperon from parity violation in the sequential decay

New CP observables in B 0 (t) → hyperon + antihyperon from parity violation in the sequential decay Abstract We consider the decay B 0 (t) → hyperon + antihyperon, followed by hyperon weak decay. We show that parity violation in the latter allows to reach new CP observables : not only Imλ f but also Reλ f can be measured. In the decay B 0 d (t) → Λ ¯ Λ (BR ∼ 10 −6), Λ → pπ − these observables reduce to sin 2α and cos 2α in the small Penguin limit, the latter solving the discrete ambiguity α → π 2 − α. For β one could consider the Cabibbo suppressed mode B 0 d (t) → Λ + c Λ