${\Lambda }_b$ Decays into $\Lambda$-Vector

Abstract

A complete study of the angular distributions of the processes, ${\Lambda }_b\to \Lambda V(1^{-})$, with $\Lambda \to p{\pi }^{-}$ and $V(J/\Psi )\to {\ell }^{+}{\ell }^{-}$ or $V({\rho }^0,\omega )\to {\pi }^{+}{\pi }^{-},$ is performed. Emphasis is put on the initial ${\Lambda }_b$ 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.

Comments: 10 pages, 2 figures