Measurement of the branching fraction of $B_c \to J/\psi \pi^+\pi^+\pi^- $relative to $B_c \to J/\psi \pi^+$ and of the production cross-section of $B_c \to J/\psi \pi^+$ relative to $B^+ \to J/\psi K^+$ with the CMS experimen

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