[en] The decays of B⁰ mesons to hadronic final states remains a rich area of physics on BaBar. Not only do the c(bar c)-K final states (e.g. B⁰ → ψ(2S)K⁰) allow for the measurement of CP Violation, but the branching fractions provide a sensitive test of the theoretical methods used to account for low energy non-perturbative QCD effects. They present the measurement of the branching fraction for the decay B⁰ → ψ(2S)K_s. The data set consists of 88.8 ± 1.0 x 10⁶ B(bar b) pairs collected on the e⁺e^- → Υ(4S) resonance on BaBar/PEP-II at the Stanford Linear Accelerator Center (SLAC). This analysis features a modification of present cuts, with respect to those published so far on BaBar, on the K_S → π⁺π^- and ψ(2S) → J/ψπ⁺π^- which aim at reducing the background while keeping the signal intact. Various data selection criteria are studied for the lepton modes (e⁺e^- and μ⁺μ^-) of the J/ψ and ψ(2S) to improve signal purity as well as study the stability of the resultant branching fractions