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$Λ_b$ Decays into $Λ$-Vector

A complete study of the angular distributions of the processes, $Λ_b \to Λ V(1^-)$, with $Λ\to p π^-$ and $V (J/Ψ) \to {\ell}^+ {\ell}^-$ or $V (ρ^0,ω) \to π^+ π^-,$ is performed. Emphasis is put on the initial $Λ_b$ polarization produced in the proton-proton collisions. The polarization density-matrices as well as angular distributions are derived and help to construct T-odd observables which allow us to perform tests of both Time-Reversal and CP violation.