Direct CP Violation in Λ_b -> n (Λ)π^+π^- Decays via ρ-ωMixing

Details Direct CP Violation in Λ_b -> n (Λ)π^+π^- Decays via ρ-ωMixing Direct CP Violation in Λ_b -> n (Λ)π^+π^- Decays via ρ-ωMixing

1998-05-15

arxiv.org/abs/hep-ph/9805332v1

Phys.Rev.D58:096013,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 2 figires, Latex

Scientific paper

10.1103/PhysRevD.58.096013

We study direct CP violation in the bottom baryon decays \Lambda_b -> f \rho^0 (\omega) -> f\pi^+\pi^- (f=n or \Lambda). It is found that in these decays via \rho-\omega mixing the CP violation could be very large when the invariant mass of the \pi^+\pi^- pair is in the vicinity of the \omega resonance. With a typical value N_c =2 in the factorization approach, the maximum CP-violating asymmetries are more than 50% and 68% for \Lambda_b -> n \pi^+\pi^- and \Lambda_b -> \Lambda \pi^+\pi^-, respectively. With the aid of heavy quark symmetry and phenomenological models for the hadronic wave functions of \Lambda_b, \Lambda and the neutron, we estimate the branching ratios of \Lambda_b -> n (\Lambda)\rho^0.

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