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In this paper we present the description of the flavor-untagged decays$B_{d}^{0}\to J/\psi K^{*0}$ and $B_{s}^{0}\to J/\psi \phi$ in the transversitybasis. The study of these $B$ mesons in that basis makes it possible to extractinformation about flavor SU(3) (or U(3)) symmetry and to verify if thefactorization assumption is feasible for the decay $B_{d}^{0}\to J/\psiK^{*0}$. The lifetime ratio $\tau_{s}/\tau_{d}$ is also extracted with thisdescription.

Time-dependent angular analysis of the decays $B_{d}^{0}\to J/\psi K^{*0}$ and $B_{s}^{0}\to J/\psi \phi$