Observation of $B^+\rightarrow J/\psi 3\pi^+ 2\pi^-$ and $B^+\rightarrow   \psi(2S) \pi^+\pi^+\pi^-$ decays
  The decays $B^+\rightarrow J/\psi 3\pi^+ 2\pi^-$ and $B^+\rightarrow \psi(2S) \pi^+\pi^+\pi^-$ are observed for the first time using a data sample corresponding to an integrated luminosity of $3.0fb^{-1}$, collected by the LHCb experiment in proton-proton collisions at the centre-of-mass energies of 7 and 8 TeV. The branching fractions relative to that of $B^+ \rightarrow \psi(2S)K^+$ are measured to be \begin{eqnarray*}   \frac {\mathcal{B}\left(B^+\rightarrow J/\psi 3\pi^+ 2\pi^- \right)}   {\mathcal{B}\left(B^+ \rightarrow \psi(2S)K^+ \right)}   & = &   \left(1.88\pm0.17\pm0.09\right)\times10^{-2},   \frac {\mathcal{B}\left(B^+\rightarrow \psi(2S) \pi^+\pi^+\pi^- \right)}   {\mathcal{B}\left(B^+ \rightarrow \psi(2S)K^+ \right)} & = &   \left(3.04\pm0.50\pm0.26\right)\times10^{-2}, \end{eqnarray*} where the first uncertainties are statistical and the second are systematic. 
LHCb collaboration: R. Aaij, B. Adeva, M. Adinolfi, Z. Ajaltouni, S.   Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, ...
hep-ex