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    Measurement of the ratio of the production cross sections times branching fractions of B c ±  → J/ψπ ± and B± → J/ψK ± and ℬ B c ± → J / ψ π ± π ± π ∓ / ℬ B c ± → J / ψ π ± B(Bc±→J/ψπ±π±π∓)/B(Bc±→J/ψπ±) \mathrm{\mathcal{B}}\left({\mathrm{B}}_{\mathrm{c}}^{\pm}\to \mathrm{J}/\psi {\pi}^{\pm }{\pi}^{\pm }{\pi}^{\mp}\right)/\mathrm{\mathcal{B}}\left({\mathrm{B}}_{\mathrm{c}}^{\pm}\to \mathrm{J}/\psi {\pi}^{\pm}\right) in pp collisions at s = 7 s=7 \sqrt{s}=7 TeV

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