Quark-diagram estimates ofCP violation in two-body baryonic$B_d^0 - \bar B_d^0$ decays

Abstract

CP violation in partial-decay-rate asymmetries are examined for some two-body baryonic decays of$B_d^0 - \bar B_d^0$ system. We discuss two feasible experimental circumstances: the symmetrice ⁺ e ⁻ collisions (i) on theZ ⁰ resonance to produce incoherent$B_d^0 \bar B_d^0$ states, and (ii) just above the ϒ(4S) resonance to produceC=even $B_d^0 \bar B_d^0$ states. Using the quark-diagram scheme, we estimate the branching ratios of those decays, and the numbers ofb $\bar b$ pairs needed for testing theCP-violating effects for 3σ signature. We find that the promising channels may beB ⁰ _d ,$\bar B_d^0 \to p\bar p$,$\Delta ^ + \bar \Delta ^ -$,$p\bar \Delta ^ -$,$\Delta ^ + \bar p$,$n\bar n$,$\Delta ^0 \bar \Delta ^0$,$n\bar \Delta ^0$,$\Delta ^0 \bar n$,$\Sigma _c^ + \bar \Sigma _c^ -$,$\Lambda _c^ + \bar \Lambda _c^ -$,$\Sigma _c^ + \bar \Lambda _c^ -$,$\Lambda _c^ + \bar \Sigma _c^ -$,$\Sigma _c^0 \bar \Sigma _c^0$,$\Xi _c^0 \bar \Xi _c^0$, which should be interesting for experimental observation.